Techdebt: Untangle S3 DELETE-methods

[bblommers]

Followup to #8000

[codecov]

Codecov Report

Attention: Patch coverage is 95.16129% with 3 lines in your changes missing coverage. Please review.

Project coverage is 94.43%. Comparing base (5581aa4) to head (8b98aa0).
Report is 4 commits behind head on master.

Files	Patch %	Lines
moto/s3/responses.py	95.08%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8044      +/-   ##
==========================================
+ Coverage   94.41%   94.43%   +0.01%     
==========================================
  Files        1134     1139       +5     
  Lines       96832    97349     +517     
==========================================
+ Hits        91424    91930     +506     
- Misses       5408     5419      +11     

Flag	Coverage Δ
servertests	28.92% <24.19%> (-0.08%)	⬇️
unittests	94.40% <95.16%> (+0.01%)	⬆️

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