[EPIC] Prow to Github Actions migration plan

[krsna-m]

Please see and comment on https://docs.google.com/document/d/1HO96fjBPIU-yxNYHsfd2gtJl5triDupu_2kgUHsQtlA document.

[github-actions]

This issue is stale because it has been open for 90 days with no
activity. It will automatically close after 30 more days of
inactivity. Reopen the issue with /reopen. Mark the issue as
fresh by adding the comment /remove-lifecycle stale.

[krsna-m]

/remove-lifecycle stale

[dprotaso]

/lifecycle frozen