ci: retest only one pr at a time & rebase if necessary
ci: retest only one pr at a time & rebase if necessary

This commit improves retest action by rebasing the pr
if it behind devel branch and adding retests to only one
pr at a time.
refer:
https://docs.github.com/en/graphql/reference/enums#mergestatestatus

Signed-off-by: Rakshith R <2c7b05ed1488c7110901626c2c56645675e22767@redhat.com>

ceph/ceph-csi,ceph/ceph-csi,ceph/ceph-csi,ceph/ceph-csi