Add issue annotation for JENKINS-22009

Author: MarkEWaite

src/test/java/hudson/plugins/git/GitSCMTest.java

@@ -1832,6 +1832,7 @@ public void testInitSparseCheckoutOverSlave() throws Exception {
      * @throws Exception
      */
     @Test
+    @Issue("JENKINS-22009")
     public void testPolling_environmentValueInBranchSpec() throws Exception {
         // create parameterized project with environment value in branch specification
         FreeStyleProject project = createFreeStyleProject();