Tokens from Altinn Test Tools not working in `IAuthenticationContext`

[martinothamar]

Description of the bug

If the library or a user tries to use IAuthenticationContext when the caller is authenticated using Altinn Test Tools, we fail to parse the token properly. Spesifically the user ID claim is encoded as an integer as opposed to a string which is what altinn-authentication does.

Steps To Reproduce

1. GetPersonalToken from Altinn Test Tools
2. Call any API using IAuthenticationContext

Additional Information

No response

[martinothamar]

Released in https://github.com/Altinn/app-lib-dotnet/releases/tag/v8.6.0-preview.9