Fix wrong multi part exception message in response.

Hardening all exception message and classes in exception handler for
reponses

Signed-off-by: SirWayne <dennis.melzer@bosch-si.com>

hawkbit-core/src/main/java/org/eclipse/hawkbit/exception/SpServerError.java

@@ -87,10 +87,6 @@ public enum SpServerError {
     */
     SP_DS_CREATION_FAILED_MISSING_MODULE("hawkbit.server.error.distributionset.creationFailed.missingModule", "Creation if Distribution Set failed as module is missing that is configured as mandatory."),
 
-    /**
-    *
-    */
-    SP_ARTIFACT_UPLOAD_FILE_LIMIT_EXCEEDED("hawkbit.server.error.artifact.uploadFailed.sizelimitexceeded", "Upload of artifact failed as the file exceeds its maximum permitted size"),
     /**
     *
     */