Support customized access token expiration

Summary

Omnibus counterpart:

• Support customized access token expiration (gitlab-org/omnibus-gitlab#8936 - closed)
• Enable setting a custom duration for ID Tokens (gitlab-org/omnibus-gitlab!8192 - merged)

Success criteria

• oidc_provider.openid_id_token_expire_in_seconds is added to gitlab.yml
• Documentations are updated.