Provide a better exception message for errors validating JWT.

[jbogard]

Typically the error message is something like:

LuckyPennySoftware.AutoMapper.License ||Fatal|| Error validating the Lucky Penny software license key System.ArgumentException: IDX14101: Unable to decode the payload '[PII of type 'Microsoft.IdentityModel.Logging.SecurityArtifact' is hidden. For more details, see https://aka.ms/IdentityModel/PII.]' as Base64Url encoded string.
 ---> System.FormatException: IDX10400: Unable to decode: '[PII of type 'System.String' is hidden. For more details, see https://aka.ms/IdentityModel/PII.]' as Base64url encoded string.
   at Microsoft.IdentityModel.Tokens.Base64UrlEncoding.ValidateAndGetOutputSize(ReadOnlySpan`1 strSpan, Int32 offset, Int32 length)
   at Microsoft.IdentityModel.JsonWebTokens.JsonWebToken.CreateClaimSet(ReadOnlySpan`1 strSpan, Int32 startIndex, Int32 length, Boolean createHeaderClaimSet)
   at Microsoft.IdentityModel.JsonWebTokens.JsonWebToken.ReadToken(ReadOnlyMemory`1 encodedTokenMemory)
   --- End of inner exception stack trace ---
   at Microsoft.IdentityModel.JsonWebTokens.JsonWebToken.ReadToken(ReadOnlyMemory`1 encodedTokenMemory)
   at Microsoft.IdentityModel.JsonWebTokens.JsonWebToken..ctor(String jwtEncodedString, TryReadJwtClaim tryReadJwtClaim)
   at Microsoft.IdentityModel.JsonWebTokens.JsonWebTokenHandler.ReadToken(String token, TokenValidationParameters validationParameters)

We can capture this exception on validation and provide a better message.

[github-actions]

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