build: auto merge backports without multisite test

The rgw multisite testing job is consistently failing
and blocking the backport of PRs that are passing all
other CI. Until issue 15177 is fixed let's disable
this check.

Signed-off-by: Travis Nielsen <tnielsen@redhat.com>

.mergify.yml

@@ -224,7 +224,6 @@ pull_request_rules:
       - "check-success=canary-tests / encryption-pvc-kms-vault-k8s-auth (quay.io/ceph/ceph:v19)"
       - "check-success=canary-tests / lvm-pvc (quay.io/ceph/ceph:v19)"
       - "check-success=canary-tests / multi-cluster-mirroring (quay.io/ceph/ceph:v19)"
-      - "check-success=canary-tests / rgw-multisite-testing (quay.io/ceph/ceph:v19)"
       - "check-success=canary-tests / encryption-pvc-kms-ibm-kp (quay.io/ceph/ceph:v19)"
       - "check-success=canary-tests / multus-public-and-cluster (quay.io/ceph/ceph:v19)"
       - "check-success=TestCephSmokeSuite (v1.27.16)"