### 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.dagrun import DagRun
    metadata = reflect_tables([DagRun], session)
    
    
    dagrun_table = metadata.tables.get(DagRun.__tablename__)
    if dagrun_table is None:
        return
    invalid_dagrun_filter = or_(
        dagrun_table.c.dag_id.is_(None),
        dagrun_table.c.run_id.is_(None),
        dagrun_table.c.execution_date.is_(None),
    )
    invalid_dagrun_count = session.scalar(select(func.count(dagrun_table.c.id)).where(invalid_dagrun_filter))
    if invalid_dagrun_count > 0:
        dagrun_dangling_table_name = _format_airflow_moved_table_name(dagrun_table.name, "2.2", "dangling")
        if dagrun_dangling_table_name in inspect(session.get_bind()).get_table_names():
            yield _format_dangling_error(
                source_table=dagrun_table.name,
                target_table=dagrun_dangling_table_name,
                invalid_count=invalid_dagrun_count,
                reason="with a NULL dag_id, run_id, or execution_date",
            )
            return
        bind = session.get_bind()
        dialect_name = bind.dialect.name
        _create_table_as(
            dialect_name=dialect_name,
            source_query=dagrun_table.select(invalid_dagrun_filter),