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Automatic merge from submit-queue Retry calls to ReadFileViaContainer in PD tests **What this PR does / why we need it**: kubectl exec occasionally fails to return a valid output string. It seems to be an issue with docker #34256. This PR retries the 'kubectl exec' call to workaround the issue. This should fix the flaky PD test issues. **Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #28283 **Release note**: NONE