### Apache Airflow version

main (development)

### Operating System

macOS 11.5.2

### Versions of Apache Airflow Providers

_No response_

### Deployment

Virtualenv installation

### Deployment details

_No response_

### What happened

If your first try fails and you have retries enabled, the subsequent tries skip right to the final `next_method(**next_kwargs)` instead of starting with `execute` again.

### What you expected to happen

Like we reset things like start date, we should wipe `next_method` and `next_kwargs` so we can retry the task from the beginning.

### How to reproduce

_No response_

### Anything else

_No response_

### Are you willing to submit PR?

- [X] Yes I am willing to submit a PR!

### Code of Conduct

- [X] I agree to follow this project's [Code of Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)

tests/models/test_taskinstance.py
assert 'test_echo_env_variables' == os.environ['AIRFLOW_CTX_DAG_ID']
        assert 'hive_in_python_op' == os.environ['AIRFLOW_CTX_TASK_ID']
        assert DEFAULT_DATE.isoformat() == os.environ['AIRFLOW_CTX_EXECUTION_DATE']
        assert DagRun.generate_run_id(DagRunType.MANUAL, DEFAULT_DATE) == os.environ['AIRFLOW_CTX_DAG_RUN_ID']
    def test_echo_env_variables(self, dag_maker):
        with dag_maker(
            'test_echo_env_variables',
            start_date=DEFAULT_DATE,
            end_date=DEFAULT_DATE + datetime.timedelta(days=10),
        ):
            op = PythonOperator(task_id='hive_in_python_op', python_callable=self._env_var_check_callback)
        dr = dag_maker.create_dagrun(
            run_type=DagRunType.MANUAL,
            external_trigger=False,
        )
        ti = TI(task=op, run_id=dr.run_id)
        ti.state = State.RUNNING
        session = settings.Session()
        session.merge(ti)
        session.commit()
        ti._run_raw_task()
        ti.refresh_from_db()
        assert ti.state == State.SUCCESS
    @patch.object(Stats, 'incr')
    def test_task_stats(self, stats_mock, create_task_instance):