Run container_down test after monit config change (sonic-net#10126)

## Description of PR

Summary:
Fixes # (issue)

### Type of change

- [x] Bug fix
- [ ] Testbed and Framework(new/improvement)
- [ ] Test case(new/improvement)


## Approach
#### What is the motivation for this PR?

event-down-ctr test is flaky because we run the test before monit changes are in place which means start delay for monit is at 5 minutes, so container_checker will not catch event.

#### How did you do it?

Move test after monit config is changed

#### How did you verify/test it?

Manual/pipeline

tests/telemetry/events/host_events.py

@@ -15,11 +15,6 @@ def test_event(duthost, gnxi_path, ptfhost, data_dir, validate_yang):
     logger.info("Beginning to test host events")
     run_test(duthost, gnxi_path, ptfhost, data_dir, validate_yang, trigger_kernel_event,
              "event_kernel.json", "sonic-events-host:event-kernel", tag, False)
-    run_test(duthost, gnxi_path, ptfhost, data_dir, validate_yang, restart_container,
-             "event_stopped_ctr.json", "sonic-events-host:event-stopped-ctr", tag, False)
-    run_test(duthost, gnxi_path, ptfhost, data_dir, validate_yang, mask_container,
-             "event_down_ctr.json", "sonic-events-host:event-down-ctr", tag, False)
-
     backup_monit_config(duthost)
     customize_monit_config(
         duthost,
@@ -37,6 +32,10 @@ def test_event(duthost, gnxi_path, ptfhost, data_dir, validate_yang):
                  "cpu_usage.json", "sonic-events-host:cpu-usage", tag, False)
         run_test(duthost, gnxi_path, ptfhost, data_dir, validate_yang, trigger_mem_threshold_exceeded_alert,
                  "mem_threshold_exceeded.json", "sonic-events-host:mem-threshold-exceeded", tag)
+        run_test(duthost, gnxi_path, ptfhost, data_dir, validate_yang, restart_container,
+                 "event_stopped_ctr.json", "sonic-events-host:event-stopped-ctr", tag, False)
+        run_test(duthost, gnxi_path, ptfhost, data_dir, validate_yang, mask_container,
+                 "event_down_ctr.json", "sonic-events-host:event-down-ctr", tag, False)
     finally:
         restore_monit_config(duthost)