OZG-3961 - add user to keycloak, cleanup

pom.xml

...in/java/de/ozgcloud/operator/keycloak/KeycloakClient.java

...java/de/ozgcloud/operator/keycloak/KeycloakException.java

...e/ozgcloud/operator/keycloak/user/KeycloakUserMapper.java

...gcloud/operator/keycloak/user/KeycloakUserReconciler.java

...oud/operator/keycloak/user/KeycloakUserRemoteService.java

.../ozgcloud/operator/keycloak/user/KeycloakUserService.java

...e/ozgcloud/operator/keycloak/user/KeycloakUserStatus.java

...or/keycloak/user/KeycloakClientUserRemoteServiceTest.java

...gcloud/operator/keycloak/user/KeycloakUserMapperTest.java

...ud/operator/keycloak/user/KeycloakUserReconcilerTest.java

...operator/keycloak/user/KeycloakUserRemoteServiceTest.java

...cloud/operator/keycloak/user/KeycloakUserServiceTest.java

...erator/keycloak/user/KeycloakUserSpecUserTestFactory.java

...cloud/operator/keycloak/user/KeycloakUserTestFactory.java

...operator/keycloak/user/UserRepresentationTestFactory.java

...TA-INF/services/org.junit.jupiter.api.extension.Extension

src/test/resources/junit-platform.properties