[feature request] Need /retest bot command

[Congrool]

What would you like to be added:

Add new command /retest to bot. It can re-trigger the CI to retest the pr.

Why is this needed:

Sometimes the CI(Github Action) may fail by accident, for example e2e-tests fail for timeout. We need a way for contributors to retest their pr in this case.

others /kind feature

[rambohe-ch]

@Congrool It's a good idea to add /retest command.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[rambohe-ch]

@kadisi would you be able to handle this case?

[rambohe-ch]

@Congrool /rerun command is supported, reviewers or higher member comment /rerun on the pull requests, all failed workflows will be triggered to rerun. #1784