Endpoint: Check status code of HTTP delete requests

[VerifiedJoseph]

Reworks endpoint class delete methods to check HTTP status code instead of response body.

[codecov]

Codecov Report

❌ Patch coverage is 70.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.92%. Comparing base (a708150) to head (f91eb46).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/Endpoint/Plugin.php	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #529   +/-   ##
=========================================
  Coverage     91.92%   91.92%           
  Complexity       79       79           
=========================================
  Files            15       15           
  Lines           285      285           
=========================================
  Hits            262      262           
  Misses           23       23           

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