Make delete confirmation more lightweight

[Swatinem]

This nulls out the get_deleted_objects, which is used by the django admin to display a list of objects, and more importantly related objects being deleted.

As in particular with big owners/repos, actually building the list of all the related objects is unreasonably slow, so slow in fact that showing the confirmation dialog times out.

To not block deletes of deeply nested object hierarchies, this will just return empty lists instead.

---

This should fix https://github.com/codecov/internal-issues/issues/1302

[seer-by-sentry]

🚨 Sentry detected 4 potential issues in your recent changes 🚨

Lower risk findings

• Line 648, codecov_auth/admin.py: Function is missing a type annotation

  • get_deleted_objects now returns empty values, potentially skipping important deletion logic.

• Line 107, core/admin.py: Function is missing a type annotation

  • get_deleted_objects returns empty values, potentially skipping important deletion logic.

• Line 661, codecov_auth/admin.py: Function is missing a type annotation for one or more arguments

  • save_related is missing type annotations for form and formsets arguments.

• Line 104, core/admin.py: Function is missing a type annotation for one or more arguments

  • delete_model is missing type annotations for request and obj arguments.

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[codecov-notifications]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
codecov_auth/admin.py	0.00%	1 Missing ⚠️
core/admin.py	50.00%	1 Missing ⚠️

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[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 96.31%. Comparing base (c2edbb3) to head (2f0d116).
Report is 2 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
codecov_auth/admin.py	0.00%	1 Missing ⚠️
core/admin.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1289      +/-   ##
==========================================
- Coverage   96.35%   96.31%   -0.04%     
==========================================
  Files         488      488              
  Lines       16919    16927       +8     
==========================================
+ Hits        16302    16304       +2     
- Misses        617      623       +6     

Flag	Coverage Δ
unit	96.31% <33.33%> (-0.04%)	⬇️

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