TUL/Reduce warn logs noise - 404 dedicated logger

[milanmajchrak]

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

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 404 (NOT_FOUND) client errors to a dedicated Log4j2 logger that is OFF by default, while refactoring the exception handler to centralize client-error logging and status-code configuration.

Changes:

• Add a dedicated Log4j2 logger (org.dspace.app.rest.exception.DSpaceApiExceptionControllerAdvice.NotFound) configured OFF by default.
• Introduce a dedicated notFoundLog logger and a logClientError() helper to route 404s separately from other 4xx warnings.
• Extract status-code parsing into getStatusCodesLoggedAsErrors() and add a new sendErrorResponseFromException() helper (currently unused).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
dspace/config/log4j2.xml	Adds an OFF-by-default logger dedicated to 404 REST responses.
dspace-server-webapp/src/main/java/org/dspace/app/rest/exception/DSpaceApiExceptionControllerAdvice.java	Adds dedicated 404 logger + helper methods to reduce 404 warn noise and refactor logging/status-code handling.

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