In the BE we throw custom errors with precise error codes (e.g.
"LABEL_ALREADY_EXISTS") before catching them in filters and rethrowing
BaseGraphQLErrors (standard errors such as NotFoundError, UserInputError
etc.).
In the FE we were grouping sentries based on the error codes but we were
actually grouping by very broad codes such as "NOT_FOUND" or
"BAD_USER_INPUT", extracted from the BaseGraphQLErrors.
To fix that, we update the BaseGraphQLError constructor api to allow to
pass on the CustomError directly and retrieve from it the original code
and store it in existing property `subCode` that we will use in the FE
to send errors to sentry.
This new api also eases usage of `userFriendlyMessage` that is passed on
to the api response and therefore to the FE when CustomError is passed
on directly to the BaseGraphQLError constructor.
c13bc60dad