Migrate Event Grid tools to new tool design

[alzimmermsft]

What does this PR do?

Migrates Event Grid 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

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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)
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[Copilot]

Pull request overview

Migrates the Event Grid toolset to the newer options model where CLI binding/validation is driven by [Option] / [OptionContainer] attributes, removing the legacy RegisterOptions/BindOptions pattern and System.CommandLine usage.

Changes:

• Converted Event Grid commands and option POCOs to attribute-based option binding (and adjusted unit test bases accordingly).
• Refactored Event Grid models to records and simplified some service helper code / JSON context definitions.
• Removed legacy Event Grid option definition infrastructure and System.CommandLine dependency from the tool project.

Reviewed changes

Copilot reviewed 23 out of 23 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
tools/Azure.Mcp.Tools.EventGrid/tests/Azure.Mcp.Tools.EventGrid.Tests/Topic/TopicListCommandTests.cs	Switches tests to subscription-aware command test base.
tools/Azure.Mcp.Tools.EventGrid/tests/Azure.Mcp.Tools.EventGrid.Tests/Subscription/SubscriptionListCommandTests.cs	Switches tests to subscription-aware command test base.
tools/Azure.Mcp.Tools.EventGrid/tests/Azure.Mcp.Tools.EventGrid.Tests/Events/EventsPublishCommandTests.cs	Switches tests to subscription-aware command test base.
tools/Azure.Mcp.Tools.EventGrid/src/Services/IEventGridService.cs	Updates interface imports to reference moved/used models.
tools/Azure.Mcp.Tools.EventGrid/src/Services/EventGridService.cs	Updates event publishing serialization and refactors some model creation helpers.
tools/Azure.Mcp.Tools.EventGrid/src/Options/Topic/TopicListOptions.cs	Replaces inherited options with explicit [Option]-based subscription/resource-group/retry options.
tools/Azure.Mcp.Tools.EventGrid/src/Options/Subscription/SubscriptionListOptions.cs	Introduces [Option]-based options (topic/location/resource-group/subscription/tenant/retry).
tools/Azure.Mcp.Tools.EventGrid/src/Options/Events/EventsPublishOptions.cs	Introduces [Option]-based publish options and required non-nullable inputs.
tools/Azure.Mcp.Tools.EventGrid/src/Options/EventGridOptionDescriptions.cs	Adds centralized text for Event Grid option descriptions.
tools/Azure.Mcp.Tools.EventGrid/src/Options/EventGridOptionDefinitions.cs	Removes legacy System.CommandLine-based option definitions.
tools/Azure.Mcp.Tools.EventGrid/src/Options/BaseEventGridOptions.cs	Removes legacy base options type.
tools/Azure.Mcp.Tools.EventGrid/src/Models/EventInputSchemas.cs	Converts schema input POCOs to records for JSON (de)serialization.
tools/Azure.Mcp.Tools.EventGrid/src/Models/EventGridTopicInfo.cs	Simplifies record metadata model (drops explicit JsonPropertyName attributes).
tools/Azure.Mcp.Tools.EventGrid/src/Models/EventGridSubscriptionInfo.cs	Simplifies record metadata model (drops explicit JsonPropertyName attributes).
tools/Azure.Mcp.Tools.EventGrid/src/Models/EventGridEventSchema.cs	Converts schema model to record form.
tools/Azure.Mcp.Tools.EventGrid/src/GlobalUsings.cs	Removes Event Grid-specific global usings (previously included System.CommandLine and others).
tools/Azure.Mcp.Tools.EventGrid/src/Commands/Topic/TopicListCommand.cs	Migrates to SubscriptionCommand<TOptions,TResult> with attribute-bound options.
tools/Azure.Mcp.Tools.EventGrid/src/Commands/Subscription/SubscriptionListCommand.cs	Migrates to AuthenticatedCommand<TOptions,TResult> with custom validation and post-bind subscription resolution.
tools/Azure.Mcp.Tools.EventGrid/src/Commands/Events/EventsPublishCommand.cs	Migrates to SubscriptionCommand<TOptions,TResult> and moves schema validation to ValidateOptions.
tools/Azure.Mcp.Tools.EventGrid/src/Commands/EventGridJsonContext.cs	Updates JSON context to include models and uses file-scoped partial type form.
tools/Azure.Mcp.Tools.EventGrid/src/Commands/BaseEventGridCommand.cs	Removes legacy Event Grid command base type.
tools/Azure.Mcp.Tools.EventGrid/src/Azure.Mcp.Tools.EventGrid.csproj	Updates core project reference path and removes System.CommandLine package reference.
servers/Azure.Mcp.Server/changelog-entries/1784319125976.yaml	Adds breaking-change entry for Event Grid tool parameter surface changes.