Migrate Event Hubs tools to new tool design

[alzimmermsft]

What does this PR do?

Migrates Event Hubs tools to new design where Register and Bind options are based on Option attributes.

GitHub issue number?

[Link to the GitHub issue this PR addresses]

Pre-merge Checklist

• Required for All PRs
  • Read contribution guidelines
  • PR title clearly describes the change
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  • Added comprehensive tests for new/modified functionality
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  • Updated servers/Azure.Mcp.Server/README.md and/or servers/Fabric.Mcp.Server/README.md documentation
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• Extra steps for Azure MCP Server tool changes:
  • Updated command list in servers/Azure.Mcp.Server/docs/azmcp-commands.md
  • Ran ./eng/scripts/Update-AzCommandsMetadata.ps1 to update tool metadata in azmcp-commands.md (required for CI)
  • Updated test prompts in servers/Azure.Mcp.Server/docs/e2eTestPrompts.md
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[Copilot]

Pull request overview

Migrates the Event Hubs toolset to the attribute-based options design (auto Register/Bind via [Option]/[OptionContainer]), updating commands/tests/models accordingly to align with the newer SubscriptionCommand<TOptions, TResult> pattern.

Changes:

• Replaced EventHubsOptionDefinitions + manual RegisterOptions/BindOptions with [Option]-attributed option POCOs across Namespace/EventHub/ConsumerGroup commands.
• Updated command implementations to the new SubscriptionCommand<TOptions, TResult> shape and adjusted JSON result models/serialization.
• Updated unit tests to use the newer command test base helpers and direct BindOptions calls.

Reviewed changes

Copilot reviewed 39 out of 39 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
tools/Azure.Mcp.Tools.EventHubs/tests/Azure.Mcp.Tools.EventHubs.Tests/Namespace/NamespaceUpdateCommandTests.cs	Updates tests to new subscription command test base + direct BindOptions.
tools/Azure.Mcp.Tools.EventHubs/tests/Azure.Mcp.Tools.EventHubs.Tests/Namespace/NamespaceGetCommandTests.cs	Moves tests to new base and aligns option-name checks with attribute-based options.
tools/Azure.Mcp.Tools.EventHubs/tests/Azure.Mcp.Tools.EventHubs.Tests/Namespace/NamespaceDeleteCommandTests.cs	Updates tests to new base + strongly-typed response deserialization helper.
tools/Azure.Mcp.Tools.EventHubs/tests/Azure.Mcp.Tools.EventHubs.Tests/EventHub/EventHubUpdateCommandTests.cs	Switches to subscription command unit test base.
tools/Azure.Mcp.Tools.EventHubs/tests/Azure.Mcp.Tools.EventHubs.Tests/EventHub/EventHubDeleteCommandTests.cs	Switches to subscription command unit test base.
tools/Azure.Mcp.Tools.EventHubs/tests/Azure.Mcp.Tools.EventHubs.Tests/ConsumerGroup/ConsumerGroupUpdateCommandTests.cs	Switches to subscription command unit test base.
tools/Azure.Mcp.Tools.EventHubs/tests/Azure.Mcp.Tools.EventHubs.Tests/ConsumerGroup/ConsumerGroupGetCommandTests.cs	Switches to subscription command unit test base.
tools/Azure.Mcp.Tools.EventHubs/tests/Azure.Mcp.Tools.EventHubs.Tests/ConsumerGroup/ConsumerGroupDeleteCommandTests.cs	Switches to subscription command unit test base.
tools/Azure.Mcp.Tools.EventHubs/src/Options/Namespace/NamespaceUpdateOptions.cs	Converts to [Option] attributes + ISubscriptionOption (+ retry container).
tools/Azure.Mcp.Tools.EventHubs/src/Options/Namespace/NamespaceGetOptions.cs	Converts to [Option] attributes + ISubscriptionOption.
tools/Azure.Mcp.Tools.EventHubs/src/Options/Namespace/NamespaceDeleteOptions.cs	Converts to [Option] attributes + ISubscriptionOption.
tools/Azure.Mcp.Tools.EventHubs/src/Options/EventHubsOptionDescriptions.cs	Adds shared option description strings for Event Hubs options.
tools/Azure.Mcp.Tools.EventHubs/src/Options/EventHubsOptionDefinitions.cs	Removes legacy explicit Option<T> definitions.
tools/Azure.Mcp.Tools.EventHubs/src/Options/EventHub/EventHubUpdateOptions.cs	Converts to [Option] attributes + ISubscriptionOption.
tools/Azure.Mcp.Tools.EventHubs/src/Options/EventHub/EventHubGetOptions.cs	Converts to [Option] attributes + ISubscriptionOption.
tools/Azure.Mcp.Tools.EventHubs/src/Options/EventHub/EventHubDeleteOptions.cs	Converts to [Option] attributes + ISubscriptionOption.
tools/Azure.Mcp.Tools.EventHubs/src/Options/ConsumerGroup/ConsumerGroupUpdateOptions.cs	Converts to [Option] attributes + ISubscriptionOption.
tools/Azure.Mcp.Tools.EventHubs/src/Options/ConsumerGroup/ConsumerGroupGetOptions.cs	Converts to [Option] attributes + ISubscriptionOption.
tools/Azure.Mcp.Tools.EventHubs/src/Options/ConsumerGroup/ConsumerGroupDeleteOptions.cs	Converts to [Option] attributes + ISubscriptionOption.
tools/Azure.Mcp.Tools.EventHubs/src/Options/BaseEventHubsOptions.cs	Removes legacy shared options base class.
tools/Azure.Mcp.Tools.EventHubs/src/Models/Namespace.cs	Removes explicit JsonPropertyName mapping in favor of source-gen + naming policy.
tools/Azure.Mcp.Tools.EventHubs/src/Models/EventHubsSku.cs	Removes explicit JsonPropertyName mapping in favor of source-gen + naming policy.
tools/Azure.Mcp.Tools.EventHubs/src/Models/EventHubsModelDefinitions.cs	Removes legacy JSON property-name constants.
tools/Azure.Mcp.Tools.EventHubs/src/Models/EventHub.cs	Removes explicit JsonPropertyName mapping in favor of source-gen + naming policy.
tools/Azure.Mcp.Tools.EventHubs/src/Models/ConsumerGroup.cs	Removes explicit JsonPropertyName mapping in favor of source-gen + naming policy.
tools/Azure.Mcp.Tools.EventHubs/src/GlobalUsings.cs	Removes toolset-global usings for legacy command-line/json usage.
tools/Azure.Mcp.Tools.EventHubs/src/Commands/Namespace/NamespaceUpdateCommand.cs	Moves to SubscriptionCommand<TOptions, TResult> and validates via ValidateOptions.
tools/Azure.Mcp.Tools.EventHubs/src/Commands/Namespace/NamespaceGetCommand.cs	Moves to new command base; consolidates single/list result shape.
tools/Azure.Mcp.Tools.EventHubs/src/Commands/Namespace/NamespaceDeleteCommand.cs	Moves to SubscriptionCommand<TOptions, TResult> and attribute-based options.
tools/Azure.Mcp.Tools.EventHubs/src/Commands/EventHubsJsonContext.cs	Updates JSON source-gen registrations to match new result types.
tools/Azure.Mcp.Tools.EventHubs/src/Commands/EventHub/EventHubUpdateCommand.cs	Moves to SubscriptionCommand<TOptions, TResult> and attribute-based options.
tools/Azure.Mcp.Tools.EventHubs/src/Commands/EventHub/EventHubGetCommand.cs	Moves to SubscriptionCommand<TOptions, TResult> and attribute-based options.
tools/Azure.Mcp.Tools.EventHubs/src/Commands/EventHub/EventHubDeleteCommand.cs	Moves to SubscriptionCommand<TOptions, TResult> and attribute-based options.
tools/Azure.Mcp.Tools.EventHubs/src/Commands/ConsumerGroup/ConsumerGroupUpdateCommand.cs	Moves to SubscriptionCommand<TOptions, TResult> and attribute-based options.
tools/Azure.Mcp.Tools.EventHubs/src/Commands/ConsumerGroup/ConsumerGroupGetCommand.cs	Moves to SubscriptionCommand<TOptions, TResult> and attribute-based options.
tools/Azure.Mcp.Tools.EventHubs/src/Commands/ConsumerGroup/ConsumerGroupDeleteCommand.cs	Moves to SubscriptionCommand<TOptions, TResult> and attribute-based options.
tools/Azure.Mcp.Tools.EventHubs/src/Commands/BaseEventHubsCommand.cs	Removes legacy Event Hubs command base class.
tools/Azure.Mcp.Tools.EventHubs/src/Azure.Mcp.Tools.EventHubs.csproj	Updates core reference style and drops direct System.CommandLine package reference.
servers/Azure.Mcp.Server/changelog-entries/1784314320111.yaml	Adds a changelog entry for the Event Hubs tool changes.