Create a schema from already weaved schemas

[pso-aeb]

In my local server I want to create a schema that is a merge of:

• local schemas (with namspaces and prefixes)
• a schema from a remote server (without namespace/prefix), that was itself produced by graphql-weaver

See https://github.com/AEB-labs/graphql-weaver/blob/weave-a-weaved-schema/spec/regression/data/merge_weaved_schema.config.ts

This runs into an error:

Failed: Schema must contain unique named types but contains multiple types named "_FieldJoin".

(on my local server the error was on _ExtendedIntrospection, but probably the same problem?)