Explicitly set CDI_LABEL_FILTER in ceph-wffc.sh

The ceph-wffc test should skip Destructive tests. While test.sh
provides a default value, explicitly setting it here ensures clarity
and prevents the test from running destructive tests in the WFFC
environment.

Author: Davo911

automation/ceph-wffc.sh

@@ -23,6 +23,7 @@ export TARGET=k8s-1.32
 export RANDOM_CR=true
 export KUBEVIRT_STORAGE=rook-ceph-default
 export CEPH_WFFC=true
+export CDI_LABEL_FILTER="!Destructive"
 export SNAPSHOT_SC=rook-ceph-block-wffc
 export BLOCK_SC=rook-ceph-block-wffc
 export CSICLONE_SC=rook-ceph-block-wffc