[FEATURE] Ignore missing principals when applying the provisioning

[heinrich-ulbricht]

Is your feature request related to a problem? Please describe. I'm always frustrated when moving templates between tenants. The templates often contain permissions for users that might not be present on the target tenant. But I don't care. It should just carry the existing ones over.

Currently provisioning fails and I have to remove non-existing principals by hand. One by one. Each removal needs another provisioning run since I don't know which users will be missing. This takes time.

Describe the solution you'd like I'd like the engine to ignore missing principals. Issue a warning and carry on privisioning:

Describe alternatives you've considered One alternative could be to prepare the template file to only contain existing principals.

[ghost]

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