MPP-3487 - Fix tests, handle missing sqlcommenter in Python 3.12,

[jwhitlock]

This makes changes needed for tests to run under Python 3.12, with no deprecation warnings.

Mock that doesn't do what was intended

For test_grab_keyfile_checks_cert_url_origin, the line

assert mock_urlopen.called_once_with(cert_url)

raises an exception:

AttributeError: 'called_once_with' is not a valid assertion. Use a spec for the mock if 'called_once_with' is meant to be an attribute.. Did you mean: 'assert_called_once_with'?

This is a new check for mock functions which are similar to the mock assertion functions. The developer probably intended:

mock_urlopen.assert_called_once_with(cert_url)

However, this also fails. It would be a bit of work to make this pass, requiring mocking the return of a valid PEM. After a bit of reading, I re-wrote as:

mock_urlopen.assert_not_called()

and called it after the SuspiciousOperation was raised.

LogRecord has new attribute taskName

This attribute was added to log the asyncio task name, python/cpython#91513 . The log_extra helper needs to ignore it.

utcnow() is finally going away

datetime.utcnow() is one of the gotcha methods. It returns a datetime in UTC time, but without timezone information. Django will catch this if you try to store in a model, but some of our test code still uses it. It now raises a DeprecationWarning. I've replaced this code with datetime.now(UTC), which returns a timezone-aware datetime.

google-cloud-sqlcommenter doesn't like Python 3.12

This module prints a bunch of DeprecationWarnings: in Python 3.11

/private/tmp/workspace/.py311/lib/python3.11/site-packages/google/__init__.py:17: DeprecationWarning: pkg_resources is deprecated as an API. See https://setuptools.pypa.io/en/latest/pkg_resources.html
  __import__('pkg_resources').declare_namespace(__name__)
/private/tmp/workspace/.py311/lib/python3.11/site-packages/google/__init__.py:17: DeprecationWarning: Deprecated call to `pkg_resources.declare_namespace('google')`.
Implementing implicit namespace packages (as specified in PEP 420) is preferred to `pkg_resources.declare_namespace`. See https://setuptools.pypa.io/en/latest/references/keywords.html#keyword-namespace-packages
  __import__('pkg_resources').declare_namespace(__name__)

In Python 3.12, pkg_resources is no longer installed automatically in virtualenvs, and these become an error:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/private/tmp/workspace/.py312/lib/python3.12/site-packages/google/__init__.py", line 17, in <module>
    __import__('pkg_resources').declare_namespace(__name__)
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^
ModuleNotFoundError: No module named 'pkg_resources'

You can install it via setuptools, but installing this unconditionally will cause issues when you are not in a virtualenv, like our Docker image. I went with skipping it for Python 3.12, and not installing the middleware if the import fails (either not installed, or installed in virtualenv without setuptools). I opened google/sqlcommenter#275 to track the issue.

[say-yawn]

Changes have very good documentation and commit message. LGTM 🚀