Add tracking doc for the Private Actions / Execution Policies stack

[irving-santiago]

What does this PR do? What is the motivation?

This is the integration branch for a 10-PR stack that adds and rewrites the Private Actions documentation to cover Execution Policies, a new authorization model for private action runners running in the Datadog Agent.

Each slice PR below targets this branch, so each is independently reviewable. This branch itself will merge into master in a single rollup PR after all 10 slices are reviewed and merged into it.

• [DOCS-XXXXX] Rewrite Private Actions Overview for Execution Policies #39045 Rewrite Private Actions Overview for Execution Policies
• [DOCS-XXXXX] Move Handling Private Action Credentials under Connections #39046 Move Handling Private Action Credentials under Connections
• [DOCS-XXXXX] Rewrite Set Up in the Datadog Agent, add Execution Policies enrollment #39047 Rewrite Set Up in the Datadog Agent, add Execution Policies enrollment
• [DOCS-XXXXX] Add Set Up a Standalone Private Action Runner #39048 Add Set Up a Standalone Private Action Runner
• [DOCS-XXXXX] Add Enrollment and Ownership #39049 Add Enrollment and Ownership
• [DOCS-XXXXX] Add Authorize Private Actions #39050 Add Authorize Private Actions
• [DOCS-XXXXX] Add Execution Policies #39051 Add Execution Policies
• [DOCS-XXXXX] Rewrite Run a Script for Execution Policies #39052 Rewrite Run a Script for Execution Policies
• [DOCS-XXXXX] Add Private Actions Reference #39053 Add Private Actions Reference
• [DOCS-XXXXX] Add Get Started with Private Actions (Execution Policies quickstart) #39054 Add Get Started with Private Actions (Execution Policies quickstart)

Merge readiness

• Ready for merge

For Datadog employees:

• ⚠️ Your branch name MUST follow the <name>/<description> convention and include the forward slash (/). If you've already created your PR with an incorrect branch name, please rename your branch and open a fresh PR.
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AI assistance

Claude Code carried a pre-drafted, human-authored content plan into this repo across all 10 slices, running Vale and fixing issues along the way.

Additional notes

[irving-santiago]

• [DOCS-XXXXX] Add Get Started with Private Actions (Execution Policies quickstart) #39054
• [DOCS-XXXXX] Add Private Actions Reference #39053
• [DOCS-XXXXX] Rewrite Run a Script for Execution Policies #39052
• [DOCS-XXXXX] Add Execution Policies #39051
• [DOCS-XXXXX] Add Authorize Private Actions #39050
• [DOCS-XXXXX] Add Enrollment and Ownership #39049
• [DOCS-XXXXX] Add Set Up a Standalone Private Action Runner #39048
• [DOCS-XXXXX] Rewrite Set Up in the Datadog Agent, add Execution Policies enrollment #39047
• [DOCS-XXXXX] Move Handling Private Action Credentials under Connections #39046
• [DOCS-XXXXX] Rewrite Private Actions Overview for Execution Policies #39045
• Add tracking doc for the Private Actions / Execution Policies stack #39044 👈 (View in Graphite)
• master

This stack of pull requests is managed by Graphite. Learn more about stacking.

[datadog-prod-us1-4]

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