fix(provisioning): Support setting new app configs as well

[nickvergessen]

• Regression from fix(ProvisioningAPI): set typed config values by via API #46991 preventing new configs to be added

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

[nickvergessen]

• Backport to 30 is done directly on the original PR [stable30] fix(ProvisioningAPI): set typed config values by via API #47393

[nickvergessen]

/backport! to stable29