Exclude Copilot review from required checks

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Author: henrymercer

pr-checks/excluded.yml

@@ -10,6 +10,7 @@ is:
   - "check-expected-release-files"
   - "Cleanup artifacts"
   - "CodeQL"
+  - "copilot-pull-request-reviewer"
   - "Dependabot"
   - "Label PR with size"
   - "Post repo size comment"