qa/suites/rados/thrash-old-clients: skip TestClsRbd.group_snap_{set,remove}

These tests assert on the number of keys on the group header object,
which changed with commits ec6224d ("cls/rbd: save group snapshot
creation order in a new key") and 3662bc7 ("cls/rbd: save max
group snap order").

Fixes: https://tracker.ceph.com/issues/68588
Signed-off-by: Ilya Dryomov <[email protected]>

Author: idryomov

qa/suites/rados/thrash-old-clients/workloads/rbd_cls.yaml

@@ -6,3 +6,5 @@ tasks:
     clients:
       client.2:
         - cls/test_cls_rbd.sh
+    env:
+      CLS_RBD_GTEST_FILTER: '-TestClsRbd.group_snap_set:TestClsRbd.group_snap_remove'