[Tracing] Add event information for blame and variant tasks to the testcase status board (#4962)

This PR adds two rows to the Task Events section of the testcase status
board: one for blame task and one for variant task.

Key changes:
- Included `blame` and `variant` in `TASK_EVENTS_NAMES` to display this
information on the testcase status board.

Related to b/435286563 and b/445896921.

Author: decoNR

src/appengine/handlers/testcase_detail/testcase_status_events.py

@@ -25,7 +25,7 @@ class TestcaseStatusInfo:
   """Methods to retrieve and format testcase events information."""
 
   TASK_EVENTS_NAMES = ('analyze', 'minimize', 'impact', 'regression',
-                       'progression')
+                       'progression', 'blame', 'variant')
   LIFECYCLE_EVENTS_TYPES = (
       events.EventTypes.TESTCASE_REJECTION,
       events.EventTypes.TESTCASE_CREATION,

src/clusterfuzz/_internal/tests/appengine/handlers/testcase_detail/testcase_status_events_test.py

@@ -61,6 +61,12 @@ def test_get_testcase_status_info_no_events(self):
         {
             'task_name': 'Progression'
         },
+        {
+            'task_name': 'Blame'
+        },
+        {
+            'task_name': 'Variant'
+        },
     ]
 
     expected_lifecycle_events = [
@@ -151,6 +157,24 @@ def setUp(self):
         closing_reason=events.ClosingReason.TESTCASE_FIXED,
         timestamp=datetime.datetime(2023, 1, 4, 0, 0, 0)).put()
 
+    data_types.TestcaseLifecycleEvent(
+        testcase_id=self.testcase_id,
+        event_type=events.EventTypes.TASK_EXECUTION,
+        task_name='blame',
+        task_stage='stage4',
+        task_status='status4',
+        task_outcome='outcome5',
+        timestamp=datetime.datetime(2023, 1, 1, 13, 0, 0)).put()
+
+    data_types.TestcaseLifecycleEvent(
+        testcase_id=self.testcase_id,
+        event_type=events.EventTypes.TASK_EXECUTION,
+        task_name='variant',
+        task_stage='stage2',
+        task_status='status3',
+        task_outcome='outcome2',
+        timestamp=datetime.datetime(2023, 1, 1, 14, 0, 0)).put()
+
 
 @test_utils.with_cloud_emulators('datastore')
 class GetTestcaseStatusMachineInfoTest(EventsInfoTest):
@@ -178,6 +202,18 @@ def test_get_testcase_status_info(self):
         'task_name': 'Progression'
     }, {
         'task_name': 'Regression'
+    }, {
+        'task_name': 'Blame',
+        'task_stage': 'stage4',
+        'task_status': 'status4',
+        'task_outcome': 'outcome5',
+        'timestamp': '2023-01-01 13:00:00.000000 UTC'
+    }, {
+        'task_name': 'Variant',
+        'task_stage': 'stage2',
+        'task_status': 'status3',
+        'task_outcome': 'outcome2',
+        'timestamp': '2023-01-01 14:00:00.000000 UTC'
     }]
 
     expected_lifecycle_events = [{
@@ -227,6 +263,34 @@ def test_format_task_execution_event(self):
     }
     self.assertEqual(result, expected)
 
+  def test_format_blame_task_execution_event(self):
+    """Verify the retrieval of a blame event information."""
+    result = self.status_info_instance.get_last_event_info(
+        event_type=events.EventTypes.TASK_EXECUTION, task_name='blame')
+
+    expected = {
+        'task_name': 'Blame',
+        'task_stage': 'stage4',
+        'task_status': 'status4',
+        'task_outcome': 'outcome5',
+        'timestamp': '2023-01-01 13:00:00.000000 UTC'
+    }
+    self.assertEqual(result, expected)
+
+  def test_format_variant_task_execution_event(self):
+    """Verify the retrieval of a variant event information."""
+    result = self.status_info_instance.get_last_event_info(
+        event_type=events.EventTypes.TASK_EXECUTION, task_name='variant')
+
+    expected = {
+        'task_name': 'Variant',
+        'task_stage': 'stage2',
+        'task_status': 'status3',
+        'task_outcome': 'outcome2',
+        'timestamp': '2023-01-01 14:00:00.000000 UTC'
+    }
+    self.assertEqual(result, expected)
+
   def test_format_testcase_creation_event(self):
     """Verify the retrieval of a testcase creation event information."""
     result = self.status_info_instance.get_last_event_info(