GitHub Actions: Prevent GitHub Actions from approving pull requests

We have introduced a new policy setting that controls whether GitHub Actions can approve pull requests. This protects against a user using Actions to satisfy the "Required approvals" branch protection requirement and merging a change that was not reviewed by another user.

To prevent breaking existing workflows Allow GitHub Actions reviews to count towards required approval is enabled by default. However, an organization admin can disable it under the organization's Actions settings.

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