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/

TBD on listing everything that needs changed.
Work in progress...

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

TBD

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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=-76

--- 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=839

--- 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=655

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