[8.13](backport #3572) Fix flaky cert tests #3577
Merged
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What is the problem this PR solves?
Fix flaky mTLS tests by ensuring the server runs for 500ms without any errors before any interactions are made with it.
We also filter out context cancelation errors returned from server.Run so they are not checked and only validate no errors were returned after the wait group is done
Related issues
This is an automatic backport of pull request Fix flaky cert tests #3572 done by Mergify.