test: move python tests from test_big_schema.py to test_io.py #4417
Description
@steve-chavez I think it might be a good idea to move test_requests_with_resource_embedding_wait_for_schema_cache_reload and test_requests_without_resource_embedding_wait_for_schema_cache_reload to IO tests (as discussed earlier). After #4411 they no longer require big schema.
Originally posted by @mkleczek in #4413 (comment)