Verify that refs inside of allOf still work

[nickgros]

Prerequisites

• I have read the documentation

What theme are you using?

core

What is your question?

In #3227, we introduced a breaking change in retrieveSchema where refs are no longer immediately resolved inside of allOf. It's unclear if this these refs are eventually resolved, so we should add a test (similar to the one modified in #3227) where the schemas in allOf are references.

In addition to this test, we should document the breaking change, or fix/revert the change.

[nickgros]

Here's a schema that contains references inside of allOf. It seems to work just fine, so I don't believe that the change broke this behavior.

Playground link

[nickgros]

This test also should confirm that this behavior didn't change:

react-jsonschema-form/packages/utils/test/schema/retrieveSchemaTest.ts

Line 920 in aa07da3

it("should merge types with $ref in them", () => {