* Added functionality to verify user invite tokens and create the initial password
* Add response types
* Fail ValidateCredentialsAsync when user is not approved
* Enable user as part of initial password creating using validation token
* Adds documentation to badrequest and changed nocontent to ok, to align with other APIs
* Fixed tests and added a new one
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Co-authored-by: nikolajlauridsen <nikolajlauridsen@protonmail.ch>