ci: Move PYTHONWARNINGS filter on build to weekly cron job

[matthewfeickert]

Description

python -m build is currenlty giving

* Creating venv isolated environment...
* Installing packages in isolated environment... (hatch-vcs>=0.3.0, hatchling>=1.13.0)
* Getting build dependencies for sdist...
* Building sdist...
/tmp/build-env-d8uvwaf0/lib/python3.11/site-packages/setuptools_scm/_get_version_impl.py:[15](https://github.com/scikit-hep/pyhf/actions/runs/6250968975/job/16971014904?pr=2336#step:5:16)3: DeprecationWarning: empty regex for tag regex is invalid, using default
  warnings.warn(
Traceback (most recent call last):
  File "/opt/hostedtoolcache/Python/3.11.5/x64/lib/python3.11/site-packages/pyproject_hooks/_in_process/_in_process.py", line 353, in <module>
    main()
  File "/opt/hostedtoolcache/Python/3.11.5/x64/lib/python3.11/site-packages/pyproject_hooks/_in_process/_in_process.py", line 335, in main
    json_out['return_val'] = hook(**hook_input['kwargs'])
                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.11.5/x64/lib/python3.11/site-packages/pyproject_hooks/_in_process/_in_process.py", line 304, in build_sdist
    return backend.build_sdist(sdist_directory, config_settings)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/tmp/build-env-d8uvwaf0/lib/python3.11/site-packages/hatchling/build.py", line 34, in build_sdist
    return os.path.basename(next(builder.build(sdist_directory, ['standard'])))
                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/tmp/build-env-d8uvwaf0/lib/python3.11/site-packages/hatchling/builders/plugin/interface.py", line 150, in build
    build_hook.initialize(version, build_data)
  File "/tmp/build-env-d8uvwaf0/lib/python3.11/site-packages/hatch_vcs/build_hook.py", line 43, in initialize
    dump_version(self.root, self.metadata.version, self.config_version_file, template=self.config_template)
  File "/tmp/build-env-d8uvwaf0/lib/python3.11/site-packages/setuptools_scm/_integration/dump_version.py", line 38, in dump_version
    write_version_to_path(
  File "/tmp/build-env-d8uvwaf0/lib/python3.11/site-packages/setuptools_scm/_integration/dump_version.py", line 62, in write_version_to_path
    final_template = _validate_template(target, template)
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/tmp/build-env-d8uvwaf0/lib/python3.11/site-packages/setuptools_scm/_integration/dump_version.py", line 45, in _validate_template
    warnings.warn(f"{template=} looks like a error, using default instead")
UserWarning: template='' looks like a error, using default instead

Instead of breaking on regular CI workflows, which isn't helpful, move the warning filter to a weekly CRON job so we can still check for possible warnings.

Checklist Before Requesting Reviewer

• Tests are passing
• "WIP" removed from the title of the pull request
• Selected an Assignee for the PR to be responsible for the log summary

Before Merging

For the PR Assignees:

• Summarize commit messages into a comprehensive review of the PR

* Move PYTHONWARNINGS filter to run on a weekly cron job to avoid interrupting
  normal development with errors due to warnings outside of direct user control.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (4ec7bf3) 98.28% compared to head (bae3bf5) 98.28%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2337   +/-   ##
=======================================
  Coverage   98.28%   98.28%           
=======================================
  Files          69       69           
  Lines        4538     4538           
  Branches      803      803           
=======================================
  Hits         4460     4460           
  Misses         45       45           
  Partials       33       33           

Flag	Coverage Δ
contrib	97.86% <ø> (ø)
doctest	60.99% <ø> (ø)
unittests-3.10	96.29% <ø> (ø)
unittests-3.11	96.29% <ø> (ø)
unittests-3.8	96.31% <ø> (ø)
unittests-3.9	96.34% <ø> (ø)

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