Stub for push calls to EB, OIDC and PdP in integration tests

Currently the push to EB, OIDC and PdP is disabled in the integration tests. Enable the push and test the different scenario's with WireMock stubbing. See https://github.com/OpenConext/OpenConext-manage/blob/main/manage-server/src/main/java/manage/control/DatabaseController.java#L94