dest api: Clean up error API

[mastercactapus]

Description:
This PR adds known error codes to the schema, and switches the errutil functions from returning mapped types, to just filtering gql errors directly (meaning, instead of returning yet another structure, components will handle the graphql error objects directly).

• errorcodes.graphqls contains the enum of all defined error codes
• errortypes.ts has functions for identifying errors and type definitions for guaranteed fields
• special case for destination type is removed (it is now just a normal field error)
• errors.d.ts is no longer needed as the errorcodes enum is now part of the schema

Which issue(s) this PR fixes:
Part of #2639

Screenshots