[Improve](Job)Job internal interface provides immediate scheduling (#23735)

Delete meaningless job status
System scheduling is executed in the time wheel
Optimize window calculation code

fe/fe-core/src/test/java/org/apache/doris/scheduler/disruptor/TimerJobManagerTest.java

@@ -132,6 +132,18 @@ public class TimerJobManagerTest {
         Assertions.assertEquals(2, testExecuteCount.get());
     }
 
+    @Test
+    public void testCycleSchedulerWithImmediatelyStart(@Mocked Env env) throws DdlException {
+        setContext(env);
+        long startTimestamp = System.currentTimeMillis();
+        job.setImmediatelyStart(true);
+        timerJobManager.registerJob(job);
+        //consider the time of the first execution and give some buffer time
+        Awaitility.await().atMost(16, TimeUnit.SECONDS).until(() -> System.currentTimeMillis()
+                >= startTimestamp + 15000L);
+        Assertions.assertEquals(3, testExecuteCount.get());
+    }
+
     @Test
     public void testOneTimeJob(@Mocked Env env) throws DdlException {
         setContext(env);