[Maintenance] Validation of ConfigurationProperties

[devtobi]

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Problem description (optional)

We currently have an inconsistent mixture of @ConfigurationProperties classes without @validated annotation and no Validation Constraints and with Validation Constraint Annotations but without @validated annotation (effectively making the constraints useless)

Desired solution

We should take a look at all @ConfigurationProperties classes and decide, whether a validation is required or not.
Also we should add @validated annotations where Validation Constraints are already in place but not "activated".

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Additional context (optional)

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