Enable keycloak-postgres only if keycloak is enabled

Francois Eleouetrequested to merge
fix-keycloak-postgres-dep into main

What does this MR do and why?

Our capd CI is failing on:

2024/12/13 15:19:07.204474 Exiting as condition "reason" equals "InstallFailed" in unit HelmRelease/sylva-units, message: Helm install failed for release sylva-units-preview/sylva-units with chart sylva-units@0.0.0-git+4fcac63a6d52.1: execution error at (sylva-units/templates/units.yaml:262:18): unit 'keycloak-postgres' is declared with a dependency on disabled unit 'cnpg-operator'
389

keycloak-postgres should not be enabled if keycloak is disabled.

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