ZCU-PUB/Reduce warn logs noise - 404 dedicated logger

[milanmajchrak]

Cherry-pick of commits 1dc5339 and db67645 into customer/zcu-pub.

Problem description

• Log 404 responses via dedicated Log4j2 logger (org.dspace.app.rest.exception.DSpaceApiExceptionControllerAdvice.NotFound) set to OFF by default
• Extract getStatusCodesLoggedAsErrors() and logClientError() helper methods
• Add sendErrorResponseFromException() for 4xx errors
• Fix row length to be less than 120 chars

Original commits:

• 1dc5339
• db67645

[Copilot]

Pull request overview

This PR reduces REST API log noise by routing expected 404 NOT_FOUND client errors to a dedicated Log4j2 logger which is OFF by default, and refactors error logging logic in the REST exception controller advice to centralize 4xx/5xx logging decisions.

Changes:

• Add a dedicated ...DSpaceApiExceptionControllerAdvice.NotFound logger (OFF by default) intended to suppress expected 404 warnings.
• Refactor REST exception logging by extracting getStatusCodesLoggedAsErrors() and logClientError() helpers.
• Introduce sendErrorResponseFromException() helper (currently not wired into any handler).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 5 comments.

File	Description
dspace/config/log4j2.xml	Adds a dedicated OFF-by-default logger for 404 responses to suppress expected 404 warnings.
dspace-server-webapp/src/main/java/org/dspace/app/rest/exception/DSpaceApiExceptionControllerAdvice.java	Adds a 404-dedicated logger and refactors client-error logging into helper methods.

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