Gh-2944: Add CancelScheduledJobHandler only when Jobs are enabled (#3005

)

* Previously, the CancelScheduledJobHandler would throw an OperationException with the message 'JobTracker not enabled' if used when Jobs were not enabled. This issue arose because the handler was being added even when Jobs were not enabled. To resolve this, changes were made to ensure that the CancelScheduledJobHandler is only added when Jobs are enabled. This ensures that the handler functions correctly and prevents the unnecessary exception from being thrown.

* Removed the 'CancelScheduledJob.class' from the 'expectedOperations' list. It shouldn't be included when the job tracker is disabled.

core/store/src/main/java/uk/gov/gchq/gaffer/store/Store.java

@@ -1009,6 +1009,7 @@ private void addCoreOpHandlers() {
             addOperationHandler(GetJobDetails.class, new GetJobDetailsHandler());
             addOperationHandler(GetAllJobDetails.class, new GetAllJobDetailsHandler());
             addOperationHandler(GetJobResults.class, new GetJobResultsHandler());
+            addOperationHandler(CancelScheduledJob.class, new CancelScheduledJobHandler());
         }
 
         // Output
@@ -1065,7 +1066,6 @@ private void addCoreOpHandlers() {
         addOperationHandler(ToSingletonList.class, new ToSingletonListHandler());
         addOperationHandler(Reduce.class, new ReduceHandler());
         addOperationHandler(Join.class, new JoinHandler());
-        addOperationHandler(CancelScheduledJob.class, new CancelScheduledJobHandler());
 
         // Context variables
         addOperationHandler(SetVariable.class, new SetVariableHandler());

core/store/src/test/java/uk/gov/gchq/gaffer/store/StoreTest.java

@@ -651,7 +651,6 @@ public void shouldReturnAllSupportedOperationsWhenJobTrackerIsDisabled(@Mock fin
                         ToSingletonList.class,
                         ForEach.class,
                         Reduce.class,
-                        CancelScheduledJob.class,
 
                         // Function
                         Filter.class,