Upgrade back-end code from Django 4.2 to 5.2 LTS

[acwhite211]

Fixes #8046

Upgrade Django from 4.2 to LTS version 5.2.

https://docs.djangoproject.com/en/6.0/releases/5.2/

Changes:

• removed USE_L10N (A localization setting, that is now defaulted to true)
• added new migration to fix many-to-many fields (django-generated)
• Migrated GET request to logout to a POST request to be in HTTP (and django) spec
  • changed the logOut user tool (in Header/userToolDefinitions) to point to a new front-end endpoint: /specify/command/logout to match the cache clearing endpoint
  • this new endpoint (defined in Router/Routes.tsx) renders the Logout component
  • the Logout component makes the POST request to the backend and returns a loading screen

Checklist

• Self-review the PR after opening it to make sure the changes look good and
  self-explanatory (or properly documented)
• Add relevant issue to release milestone
• Add pr to documentation list
• Add automated tests

Testing instructions

• Ensure strings are localized correctly
  • verify that labels are not raw schema labels, i.e. ensure schema config labels are respected.
  • Ensure that switching languages behaves correctly.
• Log out from several locations
  • Ensure that no error dialogs flash on the screen
  • Logging back in takes you to the splash screen
• General UI/UX testing
  • especially the workbench and attachments/attachment bulk upload

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch issue-8046

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[github-actions]

Warning

One or more dependencies are approaching or past End-of-Life.
Please plan upgrades accordingly.

STATUS=WARNING
NODE_VERSION=20
NODE_CYCLE=20
EOL_DATE=2026-04-30
DAYS_REMAINING=-78

--- Node.js ---
Version: 20
EOL: 2026-04-30
Status: WARNING

STATUS=OK
PYTHON_VERSION=3.12
PYTHON_CYCLE=3.12
EOL_DATE=2028-10-31
DAYS_REMAINING=837

--- Python ---
Version: 3.12
EOL: 2028-10-31
Status: OK

STATUS=OK
DJANGO_VERSION=5.2
DJANGO_CYCLE=5.2
EOL_DATE=2028-04-30
DAYS_REMAINING=653

--- Django ---
Version: 5.2
EOL: 2028-04-30
Status: OK