Secret service should be required service

This is related to #230 (closed).

Secret service was onboarded as feature and not core service.

Secret service has being more popular and there are few ADR's which are suggesting to use secret service instead of csp specific secret solution.

I would suggest to remove the feature flags and make secret service part of the helm charts as well as to install by default the secret service infrastructure.

Workaround

As for now, as workaround to enable secret service we need to execute few manual steps...

1. Need to turn on the flag secret_kv_enabled to true and to create configmap with new secret service url when deploying Service Resources.
2. Create secretwhich has configuration of the new secret kV provisioned kubectl create secret generic -n testexxon osdu-secret-svc --from-literal=SECRET_KEY_VAULT_URL=<https://secretkv.xxx.xxx>