Confusing errors when referencing wrong type name in makeExtendSchemaPlugin

[p-bakker]

Summary

If referencing a non-existing type in a makeExtendSchemaPlugin plugin that targets just one entity, this results in a cascade of exceptions on every subsequent entity

Steps to reproduce

See https://discord.com/channels/489127045289476126/1296863704364879902/1297218564876406947

Expected results

Only 1 exception on the affected entities

Actual results

Exceptions on all subsequent entities

Additional context

(https://discord.com/channels/489127045289476126/1296863704364879902/1297218564876406947)

Possible Solution

[benjie]

(Reminder to self: the issue was referencing Metadata when the type name was Metadatum. Caused extend plugin to blow up the entire Query type, which then went on to blow up mutation payload types.)