fix: Return 415 status_code for unsupported content-type headers

[chriselion]

Issue number: closes #7978

Summary

For handlers with a body parameter, previously we would raise an uncaught NotImplementedError, which results in a 500 response.

Now, raise a new subclass of NotImplementedError (to maintain existing behavior), and handle the new exception and return a 415 (Unsupported Media Type) response.

Changes

• Added a new Exception, RequestUnsupportedContentType
• Raise RequestUnsupportedContentType when trying to parse the request body but the content-type header isn't one of the known ones.
• Update the default exception handler to check for RequestUnsupportedContentType, and return a response with 415 status code.

User experience

Previously, requests for some endpoints would receive a 500 response if they passed unexpected headers.

Now, they will receive a 415 response, which is more indicative of a client error.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.73%. Comparing base (705e416) to head (deb8a73).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #7980   +/-   ##
========================================
  Coverage    96.72%   96.73%           
========================================
  Files          278      278           
  Lines        13630    13640   +10     
  Branches      1084     1086    +2     
========================================
+ Hits         13184    13194   +10     
  Misses         327      327           
  Partials       119      119           

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