Renames the post-processing file, and adds more paths to it.

This file should be removed entirely once we've upgraded to a later
version of the GAPIC generator which fixes the warnings. See #15475 for
details on this work.

- Reformat with nox
- Enable generation with librarian
- Regenerate with librarian

These were used by legacylibrarian, but are not used at all in the
librarian generation process.

…mpute-v1beta (#16721)

clean environment for datastore tests

)

This PR enables the mypy session in noxfile.py for ndb and aligns it
with the GAPIC generator template.

This PR enables the mypy session in noxfile.py for documentai-toolbox
and aligns it with the GAPIC generator template.

…16732)

This PR replaces the usage of the deprecated
`datetime.datetime.utcfromtimestamp` in the `google-auth-oauthlib`
package and testdata.

Using `datetime.datetime.fromtimestamp(session.token["expires_at"],
datetime.timezone.utc).replace(tzinfo=None)` avoids the deprecation
warning in Python 3.12 while preserving backwards compatibility by
returning a naive datetime object.

Fixes #15433

---
*PR created automatically by Jules for task
[232508796818525143](https://jules.google.com/task/232508796818525143)
started by @chalmerlowe*

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
Co-authored-by: chalmerlowe <7291104+chalmerlowe@users.noreply.github.com>

clean environment for errorreporting tests

complete migration of google-cloud-datastore