Fix/enhancement: permissions for mail rules & accounts

[shamoon]

Proposed change

Permissions for mail rules / accounts was basically never implemented, Im surprised it took this look to come up. Straightforward to do, it uses all existing code. Also the frontend was checking for Change (global) permissions instead of Delete on the button but of course the backend should have disallowed that too (it now does, screenshot just demonstrates this but the user wouldn't even see the button like the second screenshot).

Ps. Setting permissions for these on the frontend isn't implemented yet.

Fixes #3868

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Other (please explain):

Checklist:

• I have read & agree with the contributing guidelines.
• If applicable, I have included testing coverage for new code in this PR, for backend and / or front-end changes.
• If applicable, I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.
• If applicable, I have checked that all tests pass, see documentation.
• I have run all pre-commit hooks, see documentation.
• I have made corresponding changes to the documentation as needed.
• I have checked my modifications for any breaking changes.

[codecov]

Codecov Report

Merging #3869 (23fefc3) into dev (0beb9f0) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##              dev    #3869   +/-   ##
=======================================
  Coverage   95.24%   95.24%           
=======================================
  Files         335      335           
  Lines       12683    12692    +9     
  Branches     1044     1044           
=======================================
+ Hits        12080    12089    +9     
  Misses        598      598           
  Partials        5        5           

Flag	Coverage Δ
backend	94.07% <100.00%> (+<0.01%)	⬆️
frontend	96.65% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
...components/manage/settings/settings.component.html	100.00% <ø> (ø)
src-ui/src/app/data/paperless-mail-account.ts	100.00% <ø> (ø)
src-ui/src/app/data/paperless-mail-rule.ts	100.00% <ø> (ø)
src/paperless_mail/serialisers.py	97.95% <ø> (-0.09%)	⬇️
...p/components/manage/settings/settings.component.ts	98.12% <100.00%> (+0.03%)	⬆️
src/paperless_mail/admin.py	100.00% <100.00%> (ø)
src/paperless_mail/views.py	100.00% <100.00%> (ø)

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[stumpylog]

Thanks!

[github-actions]

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