[abhijeets25012-tech]

Improve the performance of DAG authorization filtering by evaluating DAG authorization checks concurrently using a ThreadPoolExecutor.

Changes
Added ThreadPoolExecutor to BaseAuthManager.filter_authorized_dag_ids.
Execute individual is_authorized_dag checks concurrently instead of sequentially.
Return an empty set immediately when no DAG IDs are provided.
Preserve the existing authorization behavior and return only authorized DAG IDs.
Motivation

filter_authorized_dag_ids previously checked each DAG authorization sequentially, which could become a performance bottleneck when many DAGs need to be authorized. Running the checks concurrently reduces the time spent waiting on individual authorization calls.

Testing

Tests were not run locally.

[abhijeets25012-tech]

Hi @vincbeck, the Providers wheel tests failed because of an HTTP 503 while downloading the CI image. It looks like an infrastructure issue and the actual tests didn't run. Could you please rerun the check? Thanks!