Implement endpoint for deleting images by entity ID

[VKTB]

Description

This PR implements a DELETE endpoint at /images that accepts an entity_id query parameter and deletes all images with that entity_id.

Testing instructions

• Review code
• Check Actions build
• Review changes to test coverage
• Successfully deletes all images associated with the supplied entity_id
• Returns 204 if entity_id is invalid or not associated with any images

Agile board tracking

closes #104

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.44%. Comparing base (d48a3bc) to head (7d5826f).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #117      +/-   ##
===========================================
+ Coverage    99.42%   99.44%   +0.01%     
===========================================
  Files           19       19              
  Lines          519      537      +18     
===========================================
+ Hits           516      534      +18     
  Misses           3        3              

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