keyclaok: extraServiceMonitor enabled without activating keycloak Metrics SPI

The extraServiceMonitor enabled by default is used to activate keycloak Metrics SPI, but we should install it first https://artifacthub.io/packages/helm/codecentric/keycloakx/2.2.1#keycloak-metrics-spi https://github.com/aerogear/keycloak-metrics-spi