test(backup): drop unnecessary host.getId() stub in live-child delete test

The deleteWithLiveChildMarksDeletePendingAndPreservesFile test asserts no
agent traffic (verified via agentManager.send is never called) because the
live-child branch only writes a DELETE_PENDING tombstone in backup_details.
host.getId() is therefore never invoked, so stubbing it triggered an
UnnecessaryStubbingException under MockitoJUnitRunner's strict mode.

Fixes the test error introduced in b7b74c4 and unblocks CI for #13074.

Author: jmsperu

plugins/backup/nas/src/test/java/org/apache/cloudstack/backup/NASBackupProviderTest.java

@@ -468,7 +468,8 @@ public void deleteWithLiveChildMarksDeletePendingAndPreservesFile()
         Mockito.when(vm.getLastHostId()).thenReturn(hostId);
         HostVO host = mock(HostVO.class);
         Mockito.when(host.getStatus()).thenReturn(Status.Up);
-        Mockito.when(host.getId()).thenReturn(hostId);
+        // Note: host.getId() is intentionally not stubbed — the live-child path never
+        // contacts the agent (verified below), so the stub would be unnecessary.
         Mockito.when(hostDao.findById(hostId)).thenReturn(host);
 
         BackupRepositoryVO repo = new BackupRepositoryVO(1L, "nas", "test-repo",