Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>
Co-authored-by: Anthonios Partheniou <partheniou@google.com>

…t_source for mTLS for Agentic Identities (#1907)

feat: Recognize workload certificate config in
`mTLS.has_default_client_cert_source` for mTLS for Agentic Identities.
This is done as part of a fix for auto-enablement of mTLS, which depends
on `mTLS.has_default_client_cert_source`. This method returned `False`
because it only checked for gcloud cert configs and secure connect
metadata, but not the workload-provided certificate_config.json. Thus,
this change is necessary to help enable mTLS for Agentic Identities on
GKE and Cloud Run Workloads.

---------

Signed-off-by: Radhika Agrawal <agrawalradhika@google.com>

PR created by the Librarian CLI to initialize a release. Merging this PR
will auto trigger a release.

Librarian Version: v1.0.1
Language Image:
us-central1-docker.pkg.dev/cloud-sdk-librarian-prod/images-prod/python-librarian-generator@sha256:b8058df4c45e9a6e07f6b4d65b458d0d059241dd34c814f151c8bf6b89211209
<details><summary>google-auth: 2.46.0</summary>

##
[2.46.0](googleapis/google-auth-library-python@v2.45.0...v2.46.0)
(2026-01-05)

### Features

* Recognize workload certificate config in
has_default_client_cert_source for mTLS for Agentic Identities (#1907)
([0b9107d5](googleapis/google-auth-library-python@0b9107d5))

### Bug Fixes

* Fix test coverage for mtls_helper (#1886)
([02e71631](googleapis/google-auth-library-python@02e71631))

* use .read() instead of .content.read() in aiohttp transport (#1899)
([12f4470f](googleapis/google-auth-library-python@12f4470f))

* add types to default and verify_token and Request __init__ based on
comments in the source code. (#1588)
([59a5f588](googleapis/google-auth-library-python@59a5f588))

* fix the document of secure_authorized_session (#1536)
([5d001470](googleapis/google-auth-library-python@5d001470))

* raise RefreshError for missing token in impersonated credentials
(#1897)
([94d04e09](googleapis/google-auth-library-python@94d04e09))

* remove setup.cfg configuration for creating universal wheels (#1693)
([c767531c](googleapis/google-auth-library-python@c767531c))

### Documentation

* update urllib3 docstrings for v2 compatibility (#1903)
([3f1aeea2](googleapis/google-auth-library-python@3f1aeea2))

</details>

…atches (#1907)

* chore: update benchmark to assert on empty df returned by to_pandas_batches

* lint