OZG-4453 refactor dependency injection; adjust access modifier

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

...cloud/operator/keycloak/KeycloakGenericRemoteService.java

...or/keycloak/client/KeycloakClientPreconditionService.java

...ud/operator/keycloak/client/KeycloakClientReconciler.java

...operator/keycloak/client/KeycloakClientRemoteService.java

...cloud/operator/keycloak/client/KeycloakClientService.java

...ozgcloud/operator/keycloak/group/KeycloakGroupMapper.java

...ator/keycloak/group/KeycloakGroupPreconditionService.java

...loud/operator/keycloak/group/KeycloakGroupReconciler.java

...d/operator/keycloak/group/KeycloakGroupRemoteService.java

...zgcloud/operator/keycloak/group/KeycloakGroupService.java

...ozgcloud/operator/keycloak/realm/KeycloakRealmMapper.java

...loud/operator/keycloak/realm/KeycloakRealmReconciler.java

...d/operator/keycloak/realm/KeycloakRealmRemoteService.java

...zgcloud/operator/keycloak/realm/KeycloakRealmService.java

...erator/keycloak/user/KeycloakUserPreconditionService.java

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

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

...cloud/operator/keycloak/user/KubernetesRemoteService.java

...ava/de/ozgcloud/operator/keycloak/KeycloakClientTest.java