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**Description**
- The `airflow serve_logs` command has been removed from the CLI as of 2.0.0
- When using `CeleryExecutor`, the `airflow celery worker` command runs the `serve_logs` process in the background.
- We should do the same with `airflow scheduler` command when using `LocalExecutor` or `SequentialExecutor`
 
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**Use case / motivation**
- This will allow for viewing task logs in the UI when using `LocalExecutor` or `SequentialExecutor` without elasticsearch configured.

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**Are you willing to submit a PR?**
Yes. Working with @dimberman .

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**Related Issues**
- https://github.com/apache/airflow/issues/14222
- https://github.com/apache/airflow/issues/13331

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airflow/cli/cli_parser.py
"""Define a positive int type for an argument."""
    def _check(value):
        try:
            value = int(value)
            if allow_zero and value == 0:
                return value
            if value > 0:
                return value
        except ValueError:
            pass
        raise argparse.ArgumentTypeError(f"invalid positive int value: '{value}'")
    return _check
ARG_DAG_ID = Arg(("dag_id",), help="The id of the dag")
ARG_TASK_ID = Arg(("task_id",), help="The id of the task")
ARG_EXECUTION_DATE = Arg(("execution_date",), help="The execution date of the DAG", type=parsedate)
ARG_TASK_REGEX = Arg(
    ("-t", "--task-regex"), help="The regex to filter specific task_ids to backfill (optional)"
)
ARG_SUBDIR = Arg(
    ("-S", "--subdir"),
    help=(
        "File location or directory from which to look for the dag. "
        "Defaults to '[AIRFLOW_HOME]/dags' where [AIRFLOW_HOME] is the "
        "value you set for 'AIRFLOW_HOME' config you set in 'airflow.cfg' "
    ),
    default='[AIRFLOW_HOME]/dags' if BUILD_DOCS else settings.DAGS_FOLDER,
)
ARG_START_DATE = Arg(("-s", "--start-date"), help="Override start_date YYYY-MM-DD", type=parsedate)