fix(linstor): use name filter in isResourceDefinitionGone

resourceDefinitionList(null, ...) fetched every RD on the cluster and
then streamed for a match — repeated once per second from
waitForResourceDefinitionDeleted this scales with cluster size. Pass
the name as the rscDfns filter so the controller returns an empty
list when the RD is gone.

Also clarify the timeout-constant Javadoc per copilot/abh1sar review
(constant is used from management-server paths too, not just agents).

Addresses review comments from @rp- and Copilot on #13076.

Author: jmsperu

plugins/storage/volume/linstor/src/main/java/org/apache/cloudstack/storage/datastore/util/LinstorUtil.java

@@ -404,22 +404,23 @@ public static List<ResourceDefinition> getRDListStartingWith(DevelopersApi api,
     /**
      * Default per-call timeout for {@link #waitForResourceDefinitionDeleted}. Long enough for a
      * healthy LINSTOR controller to finish a normal delete; short enough not to block the calling
-     * agent thread for too long if the delete is genuinely stuck.
+     * thread for too long if the delete is genuinely stuck. Used both from the management server
+     * (e.g. {@code LinstorPrimaryDataStoreDriverImpl}) and from KVM agent paths.
      */
     public static final long DEFAULT_RD_DELETE_VERIFY_TIMEOUT_MILLIS = 30_000L;
 
     /**
      * Returns {@code true} if the named resource definition is no longer present on the LINSTOR
      * controller. Used after a {@code resourceDefinitionDelete} to verify the delete actually
      * completed (LINSTOR can return success on the API call while the resource lingers in
-     * DELETING state due to peer issues, lost quorum, or down satellites).
+     * DELETING state due to peer issues, lost quorum, or down satellites). Uses the
+     * controller-side name filter rather than scanning every RD on the cluster (cheap even
+     * when polled once per second from {@link #waitForResourceDefinitionDeleted}).
      */
     public static boolean isResourceDefinitionGone(DevelopersApi api, String rscName) throws ApiException {
-        List<ResourceDefinition> all = api.resourceDefinitionList(null, false, null, null, null);
-        if (all == null) {
-            return true;
-        }
-        return all.stream().noneMatch(rd -> rscName.equalsIgnoreCase(rd.getName()));
+        List<ResourceDefinition> matching =
+                api.resourceDefinitionList(Collections.singletonList(rscName), false, null, null, null);
+        return matching == null || matching.isEmpty();
     }
 
     /**