OZG-4097 itcase: Test connection failed error code

pom.xml

...ichten/postfach/osiv2/exception/Osi2ExceptionHandler.java

...ud/nachrichten/postfach/osiv2/model/BinaryFileUpload.java

...hten/postfach/osiv2/storage/Osi2AttachmentFileMapper.java

...ten/postfach/osiv2/storage/Osi2AttachmentFileService.java

...ichten/postfach/osiv2/transfer/Osi2QuarantineService.java

...ten/postfach/osiv2/transfer/PostfachApiFacadeService.java

src/main/resources/application-local.yml

...ichten/postfach/osiv2/OsiPostfachRemoteServiceITCase.java

.../ozgcloud/nachrichten/postfach/osiv2/TestApplication.java

...postfach/osiv2/extension/AttachmentExampleUploadUtil.java

...ten/postfach/osiv2/extension/VorgangManagerContainer.java

...stfach/osiv2/extension/VorgangManagerServerExtension.java

...en/postfach/osiv2/transfer/Osi2QuarantineServiceTest.java

src/test/resources/application-itcase.yml

src/test/resources/wiremock/proto/binaryfile.model.proto

src/test/resources/wiremock/proto/binaryfile.proto

src/test/resources/wiremock/proto/callcontext.proto

...test/resources/wiremock/proto/clientattribute.model.proto

src/test/resources/wiremock/proto/clientattribute.proto