chore: clean up django region tags

[glasnt]

Description

Removes old tags, cleans up a newer tag to confirm with format (underscore separated names)

Checklist

• I have followed Sample Guidelines from AUTHORING_GUIDE.MD
• Tests pass: nox -s py-3.6 (see Test Environment Setup)
• Lint pass: nox -s lint (see Test Environment Setup)
• Please merge this PR for me once it is approved.

[snippet-bot]

Here is the summary of changes.

You are about to add 3 region tags.

• appengine/flexible/django_cloudsql/mysite/settings.py:167, tag gaeflex_py_django_static_config
• kubernetes_engine/django_tutorial/mysite/settings.py:112, tag gke_django_static_config
• run/django/mysite/settings.py:159, tag cloudrun_django_static_config

You are about to delete 2 region tags.

• run/django/mysite/settings.py:24, tag cloudrun_django_secretconfig
• run/django/mysite/settings.py:119, tag cloudrun_django_dbconfig

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[dandhlee]

does staticconfig tag still need to be here? Or do you plan on removing that in a future PR once static_config region tag fully replaces it?

[glasnt]

it does for now, until I replace it with the new version in the docs, then I can remove it from the sample in another PR

[dandhlee]

Sounds good! Thank you for clarifying it.