OZG-6239 Create XtaCloseRequest class and adjust to merge issues

...a/de/ozgcloud/xta/test/app/data/XtaMessageRepository.java

...java/de/ozgcloud/xta/test/app/mapper/ExceptionMapper.java

...n/java/de/ozgcloud/xta/test/app/mapper/RequestMapper.java

.../java/de/ozgcloud/xta/test/app/mapper/ResponseMapper.java

.../java/de/ozgcloud/xta/test/app/model/XtaCloseRequest.java

.../de/ozgcloud/xta/test/app/model/XtaGetMessageRequest.java

.../java/de/ozgcloud/xta/test/app/server/MsgBoxPortImpl.java

...va/de/ozgcloud/xta/test/app/service/RequestValidator.java

...loud/xta/test/app/service/XtaCloseRequestTestFactory.java

...a/de/ozgcloud/xta/test/app/service/XtaMessageService.java

.../ozgcloud/xta/test/app/data/XtaMessageRepositoryTest.java

.../de/ozgcloud/xta/test/app/factory/XtaFileTestFactory.java

.../ozgcloud/xta/test/app/factory/XtaMessageTestFactory.java

.../de/ozgcloud/xta/test/app/mapper/ExceptionMapperTest.java

...de/ozgcloud/xta/test/app/mapper/PartyTypeTestFactory.java

...va/de/ozgcloud/xta/test/app/mapper/RequestMapperTest.java

...a/de/ozgcloud/xta/test/app/mapper/ResponseMapperTest.java

...a/de/ozgcloud/xta/test/app/mapper/XtaFileTestFactory.java

...e/ozgcloud/xta/test/app/mapper/XtaMessageTestFactory.java

...a/de/ozgcloud/xta/test/app/server/MsgBoxPortImplTest.java