Check all multi-cluster manifests in check-manifest.sh (antrea-io#5672)

There was a new manifest "antrea-multicluster-leader.yml" added for
Antrea Multi-cluster, but it's not added to the check list. So, revise
check-manifest.sh to check all manifests.

Signed-off-by: Lan Luo <luola@vmware.com>

ci/check-manifest.sh

@@ -40,11 +40,7 @@ rm "${YAMLS[@]}"
 make manifest
 diff="$(git status --porcelain ${YAMLS[@]})"
 
-MULTICLUSTER_YAMLS=(
-    "multicluster/build/yamls/antrea-multicluster-leader-global.yml"
-    "multicluster/build/yamls/antrea-multicluster-leader-namespaced.yml"
-    "multicluster/build/yamls/antrea-multicluster-member.yml"
-)
+MULTICLUSTER_YAMLS=($(ls multicluster/build/yamls/*.yml))
 
 rm "${MULTICLUSTER_YAMLS[@]}"
 cd multicluster; make manifests; cd ..