Skip docs-prs approval for release-notes-automation bot

[ebembi-crdb]

This change updates our docs-prs approval script to treat the release-notes-automation[bot] account as if it were a member of the docs-prs team.

We’re making this change because we now have an automation that creates release notes PRs, and those PRs should not be blocked by a missing docs-prs approval when they are first drafted.