Duplicated client creation upon running setup to upgrade image versions

[moabu]

Describe the bug
Upon upgrading the image versions or reapplying the setup in CN the persistence and configurator jobs are run. Because some entries were missing in the DB the persistence job activated the upgrade process. However, that lead to duplicate clients created which is an undesired effect.

To Reproduce
Steps to reproduce the behavior:

1. Install using microk8s using an older image version such as v1.0.0-beta.15 with mysql as the backend
2. Upgrade using helm upgrade to the latest with the _dev images
3. Issue is observed

It can be reproduced with the following behavior as well.

1. deploy cluster for the first time
2. wipe configs and secrets
3. re-deploy cluster (configurator will upload mounted config.json and secret.json that created during step 1)
4. duplicate of Jans Role Based Client, admin-ui-client, and Jans Admin UI Client are created because the IDs are created during running persistence-loader (if not exist in config layer)

Expected behavior
No duplicated entries.