### Body

We have several tests marked in the code base with `@pytest.mark.quarantined`
It means that the tests are flaky and if fail in CI it does not fail the build.
The goal is to fix the tests and make them stable.

This task is to gather all of them under the same issue instead of dedicated issue per test.

- [x] [TestImpersonation](https://github.com/apache/airflow/blob/bfcae349b88fd959e32bfacd027a5be976fe2132/tests/core/test_impersonation_tests.py#L117)
- [x] [TestImpersonationWithCustomPythonPath](https://github.com/apache/airflow/blob/bfcae349b88fd959e32bfacd027a5be976fe2132/tests/core/test_impersonation_tests.py#L181)
- [x] [test_exception_propagation](https://github.com/apache/airflow/blob/76f81cd4a7433b7eeddb863b2ae6ee59176cf816/tests/jobs/test_local_task_job.py#L772)
- [x] [test_localtaskjob_maintain_heart_rate](https://github.com/apache/airflow/blob/76f81cd4a7433b7eeddb863b2ae6ee59176cf816/tests/jobs/test_local_task_job.py#L402)
- [x] [test_exception_propagation](https://github.com/apache/airflow/blob/4d0fd8ef6adc35f683c7561f05688a65fd7451f4/tests/executors/test_celery_executor.py#L103)
- [x] [test_process_sigterm_works_with_retries](https://github.com/apache/airflow/blob/65010fda091242870a410c65478eae362899763b/tests/jobs/test_local_task_job.py#L770)


### Committer

- [X] I acknowledge that I am a maintainer/committer of the Apache Airflow project.
_, task = create_dummy_dag("test_localtaskjob_double_trigger")
        ti_run = TaskInstance(task=task, execution_date=DEFAULT_DATE)
        ti_run.refresh_from_db()
        job1 = LocalTaskJob(task_instance=ti_run, executor=SequentialExecutor())
        time_start = time.time()
        
        
        
        
        mock_return_code.side_effect = [None, 0, None]
        with timeout(10):
            job1.run()
        assert mock_return_code.call_count == 3
        time_end = time.time()
        assert self.mock_base_job_sleep.call_count == 1
        assert job1.state == State.SUCCESS
        
        
        #
        
        assert time_end - time_start < job1.heartrate
        assert "Task exited with return code 0" in caplog.text
    def test_mark_failure_on_failure_callback(self, caplog, get_test_dag):