Prevent review comment controller collisions across repositories

[Copilot]

In multi-root workspaces, checking out a second PR could make comment controls unresponsive for the first PR. Review controllers could share an ID because the repository segment incorrectly repeated the owner.

• Controller identity

  • Qualify IDs by owner, repository, and PR number:

    github-review-${owner}-${repositoryName}-${number}

• Regression coverage

  • Verify same-owner, same-number PRs in different repositories receive distinct, correctly qualified controller IDs.

• Fixes Unable to add comments on diff files in workspaces with more than one PR in review #8861

[azure-pipelines]

Azure Pipelines:
There may be pipelines that require an authorized user to comment /azp run to run.