Add endpoint error handling

[seallard]

This PR removes a lot of duplicated error handling logic in the endpoints by extracting it to a separate error handler.

The code is easier to read since the indentation is decreased, duplicated logic is removed, fewer overall lines of code and improved separation of concerns 👍

Additionally, it:

• Ensures we do not return stack traces in the error response (security risk) but just log them instead.
• Ensures the correct HTTP status is returned for internal server errors (should not be 409 for a blank catch-all exception).

[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 SonarCloud

[ChrOertlin]

Nice job!