TEST: resolve all refs

[braingram]

Resolve all refs for load_schema(..., resolve_refs=True). This can create a recursive schema (which is fine for validation but will fail check_schema and result in infinite walks for itertree, walk, etc). I suspect we will want to make this an "opt-in" behavior since I think this is a breaking change. If we want to change the defaults it'll have to wait until asdf 6.0.

Lots of downstream failures from essentially:

• pytest-asdf-plugin using resolve_refs (which I don't think is needed)
• any schema referencing ndarray (or a similar recursive schema) now is a recursive dict
• pytest-asdf-plugin passes this recursive dict to check_schema (which fails since that's not supported)

Making the behavior opt-in and/or updating pytest-asdf-plugin should those failures.

Closes: #1727

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