KOP-3126 Test schema validation with invalid id

...ava/de/ozgcloud/xta/client/XtaSchemaValidationITCase.java

.../xta/client/factory/XtaMockServerResponseTestFactory.java

...-9aac-b3ee82041ef0_Geschaeftsgang.Geschaeftsgang.0201.zip

...ses/getMessage/invalid-id-attribute/envelope.template.xml

...-responses/getMessage/stage-example/envelope.template.xml

...k-responses/getMessage/stage-example/example2/example.xml

...ces/mock-responses/getMessage/valid/envelope.template.xml

...sList/MessageMetaData/stage-example/metadata.template.xml