### Description

The current length limit for the `login` parameter in an HTTP connection is 500 characters. It'd be nice if this was 5000 characters like the `password` parameter.

### Use case/motivation

We've run into an issue with an API we need to integrate with. It uses basic HTTP authentication, and both username and password are about 900 characters long each. We don't have any control over this API, so we cannot change the authentication method, nor the length of these usernames and passwords.

### Related issues

_No response_

### Are you willing to submit a 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)

from airflow.models.dag import DAG
    from airflow.models.dagbag import DagBag
    dagbag = DagBag()
    
    dagbag.sync_to_db(session=session)
    
    DAG.deactivate_unknown_dags(dagbag.dags.keys(), session=session)
@provide_session
def downgrade(*, to_revision, from_revision=None, show_sql_only=False, session: Session = NEW_SESSION):
    """
    Downgrade the airflow metastore schema to a prior version.
    :param to_revision: The alembic revision to downgrade *to*.
    :param show_sql_only: if True, print sql statements but do not run them
    :param from_revision: if supplied, alembic revision to dawngrade *from*. This may only
        be used in conjunction with ``sql=True`` because if we actually run the commands,
        we should only downgrade from the *current* revision.
    :param session: sqlalchemy session for connection to airflow metadata database
    """
    if from_revision and not show_sql_only:
        raise ValueError(
            "`from_revision` can't be combined with `sql=False`. When actually "
            "applying a downgrade (instead of just generating sql), we always "
            "downgrade from current revision."
        )
    if not settings.SQL_ALCHEMY_CONN:
        raise RuntimeError("The settings.SQL_ALCHEMY_CONN not set.")
    
    from alembic import command
    log.info("Attempting downgrade to revision %s", to_revision)