[DOCS-XXXXX] Add Enrollment and Ownership

[irving-santiago]

What does this PR do? What is the motivation?

Fixes DOCS-XXXXX

Adds a new "Enrollment and Ownership" page explaining how a private action runner enrolls with Datadog, how enrollment sets ownership, and how ownership determines the authorization model (Execution Policies vs. Connections). Includes a "Manage access to owned runners" section.

Merge readiness

• Ready for merge

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AI assistance

Claude Code carried this page's content over from a pre-drafted, QA-verified draft and ran Vale. Renamed one heading that used an undefined acronym ("PAR ownership" → "Runner ownership") for clarity.

Additional notes

[irving-santiago]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• [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 👈 (View in Graphite)
• [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
• master

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[github-actions]

Preview links (active after the build_preview check completes)

New or renamed files

• https://docs-staging.datadoghq.com/irving.santiago/par-ep-05-enroll-runner/actions/private_actions/enroll_runner

[datadog-prod-us1-5]

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