ci: prevent test-only PRs from bypassing cmuxTests compilation - #12174

Bugbot Analysis Progress (4m 41s elapsed)

✅ Gathered PR context (25s)
✅ Completed bug detection (4m 16s)
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Final Result: Bugbot completed review - no issues found! ✅

Request ID: serverGenReqId_587dc6e6-ce50-4b66-a919-7ff3f0a48ef8