Move RDKIT test_substructure_search_on_large_molecule into TestRDKitToolkitWrapper
Move RDKIT test_substructure_search_on_large_molecule into TestRDKitToolkitWrapper

openforcefield/openff-toolkit,open-forcefield-group/openforcefield,openforcefield/openff-toolkit,open-forcefield-group/openforcefield,open-forcefield-group/openforcefield