Change type of errorType field in Error DTO class from enum to String

[ermadmi78]

To deserialize the error in the GraphQL response, Kobby generates a DTO class that looks like this:

public data class CinemaError(
  public val message: String,
  @JsonInclude(value = JsonInclude.Include.NON_EMPTY)
  public val locations: List<CinemaErrorSourceLocation>? = null,
  @JsonInclude(value = JsonInclude.Include.NON_ABSENT)
  public val errorType: CinemaErrorType? = null,
  @JsonInclude(value = JsonInclude.Include.NON_EMPTY)
  public val path: List<Any>? = null,
  @JsonInclude(value = JsonInclude.Include.NON_EMPTY)
  public val extensions: Map<String, Any?>? = null,
) 

The errorType field is enum:

public enum class CinemaErrorType {
  InvalidSyntax,
  ValidationError,
  DataFetchingException,
  OperationNotSupported,
  ExecutionAborted,
}

This enum limits the possible error type to 5 values. But there are no standards for possible error types in GraphQL responses, which sometimes results in deserialization errors. For example, in this case, the error type is UnauthorizedException.

I think we should stop using enums for error types and return the error type as a String.

[ermadmi78]

Fixed in release 2.1.1