add new testNumberOfJobs() to SchedulerJobsTest (re. FINERACT-922)

This would catch problems such as the integration tests running "too
early" (before Flyway has fully initialized the database), which I have
a suspicion could be one of (many) causes of the unstable scheduler
tests, notably because of the IllegalArgumentException at
SchedulerJobsTest.java:90 in https://github.com/apache/fineract/pull/817

fineract-provider/src/integrationTest/java/org/apache/fineract/integrationtests/SchedulerJobsTest.java

@@ -97,6 +97,12 @@ public class SchedulerJobsTest {
         }
     }
 
+    @Test
+    public void testNumberOfJobs() {
+        List<Integer> jobIds = schedulerJobHelper.getAllSchedulerJobIds();
+        assertEquals("Number of jobs in database and code do not match: " + jobIds, JobName.values().length, jobIds.size());
+    }
+
     @Test
     public void testFlippingJobsActiveStatus() throws InterruptedException {
         // Stop the Scheduler while we test flapping jobs' active on/off, to avoid side