Add missing space to log message in task completion logs (apache#11934)

Previously it looked like this

    INFO - Marking task as SUCCESS.dag_id=scenario1_case1_1_1, ...

Now it looks like

    INFO - Marking task as SUCCESS. dag_id=scenario1_case1_1_1, ...

airflow/models/taskinstance.py

@@ -1087,7 +1087,7 @@ def _run_raw_task(
             self.refresh_from_db(lock_for_update=True)
             self.state = State.SKIPPED
             self.log.info(
-                'Marking task as SKIPPED.'
+                'Marking task as SKIPPED. '
                 'dag_id=%s, task_id=%s, execution_date=%s, start_date=%s, end_date=%s',
                 self.dag_id,
                 self.task_id,
@@ -1123,7 +1123,7 @@ def _run_raw_task(
         # Recording SUCCESS
         self.end_date = timezone.utcnow()
         self.log.info(
-            'Marking task as SUCCESS.'
+            'Marking task as SUCCESS. '
             'dag_id=%s, task_id=%s, execution_date=%s, start_date=%s, end_date=%s',
             self.dag_id,
             self.task_id,

tests/cli/commands/test_task_command.py

@@ -318,7 +318,7 @@ def test_logging_with_run_task(self):
         self.assert_log_line("Log from TI Logger", logs_list)
         self.assert_log_line("Log from Print statement", logs_list, expect_from_logging_mixin=True)
 
-        self.assertIn(f"INFO - Marking task as SUCCESS.dag_id={self.dag_id}, "
+        self.assertIn(f"INFO - Marking task as SUCCESS. dag_id={self.dag_id}, "
                       f"task_id={self.task_id}, execution_date=20170101T000000", logs)
 
     @mock.patch("airflow.task.task_runner.standard_task_runner.CAN_FORK", False)
@@ -343,7 +343,7 @@ def test_logging_with_run_task_subprocess(self):
 
         self.assertIn(f"INFO - Running: ['airflow', 'tasks', 'run', '{self.dag_id}', "
                       f"'{self.task_id}', '{self.execution_date_str}',", logs)
-        self.assertIn(f"INFO - Marking task as SUCCESS.dag_id={self.dag_id}, "
+        self.assertIn(f"INFO - Marking task as SUCCESS. dag_id={self.dag_id}, "
                       f"task_id={self.task_id}, execution_date=20170101T000000", logs)
 
     def test_log_file_template_with_run_task(self):