refine admin experience

[nora-codecov]

Purpose/Motivation

Realized that the delete buttons weren't doing what I wanted them to do - I wanted them to delete the connection not the object. Added these customizations to prevent related objects from being deleted by accident.

Links to relevant tickets

https://github.com/codecov/engineering-team/issues/2060

Notes to Reviewer

added tests, and these changes were thoroughly tested on my local

[codecov-notifications[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

:white_check_mark: All tests successful. No failed tests found.

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[codecov-qa[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 91.71%. Comparing base (e85b89e) to head (b39a1a1).

:white_check_mark: All tests successful. No failed tests found.

@@            Coverage Diff             @@
##             main     #713      +/-   ##
==========================================
+ Coverage   91.70%   91.71%   +0.01%     
==========================================
  Files         632      632              
  Lines       17014    17039      +25     
==========================================
+ Hits        15603    15628      +25     
  Misses       1411     1411              

Flag	Coverage Δ
unit	91.71% <100.00%> (+0.01%)	:arrow_up:
unit-latest-uploader	91.71% <100.00%> (+0.01%)	:arrow_up:

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

Files	Coverage Δ
codecov_auth/admin.py	100.00% <100.00%> (ø)

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[codecov-public-qa[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 91.71%. Comparing base (e85b89e) to head (b39a1a1).

:white_check_mark: All tests successful. No failed tests found.

@@            Coverage Diff             @@
##             main     #713      +/-   ##
==========================================
+ Coverage   91.70%   91.71%   +0.01%     
==========================================
  Files         632      632              
  Lines       17014    17039      +25     
==========================================
+ Hits        15603    15628      +25     
  Misses       1411     1411              

Flag	Coverage Δ
unit	91.71% <100.00%> (+0.01%)	:arrow_up:
unit-latest-uploader	91.71% <100.00%> (+0.01%)	:arrow_up:

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

Files	Coverage Δ
codecov_auth/admin.py	100.00% <100.00%> (ø)

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 96.01%. Comparing base (e85b89e) to head (b39a1a1).

:white_check_mark: All tests successful. No failed tests found.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #713 +/- ## =========================================== Coverage 96.01000 96.01000 =========================================== Files 814 814 Lines 18365 18390 +25 =========================================== + Hits 17633 17658 +25 Misses 732 732 ``` | [Flag](https://app.codecov.io/gh/codecov/codecov-api/pull/713/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=codecov) | Coverage Δ | | |---|---|---| | [unit](https://app.codecov.io/gh/codecov/codecov-api/pull/713/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=codecov) | `91.71% <100.00%> (+0.01%)` | :arrow_up: | | [unit-latest-uploader](https://app.codecov.io/gh/codecov/codecov-api/pull/713/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=codecov) | `91.71% <100.00%> (+0.01%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=codecov#carryforward-flags-in-the-pull-request-comment) to find out more.

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