Remove hardcoded PostgreSQL passwords from Chart values

[SebastianBezold]

PR #76 removed the hardcoded passwords for PostgreSQL from the Charts default values.
However they are still present in [values-int.yaml](https://github.com/eclipse-tractusx/managed-service-orchestrator/blob/main/charts/orchestrator/values-int.yaml#L45.

Like already mentioned in #75, these should be removed and either be replaced by using the auto-generated passwords provided by the bitnami Chart or by using passwords provided in a secure vault.

Again the hint to the discussion on the mailing list with examples on how to use the auto-generated passwords