Remove VO plugin API and revert tests to underlying object (#3470) #1160

Job	Run time
Code style checks	16s
PEP 517	22s
Security audit	19s
Python 3.11 with coverage checking, all deps, and remote data	35m 40s
OS X - Python 3.12	9m 52s
Windows - Python 3.10	22m 18s
Linux - Python 3.13	14m 11s
Python 3.13 with latest dev versions of key dependencies, and remote data	32m 18s
Python 3.11 with stable versions of dependencies and Roman	12m 49s
Upload Coverage	4s
	2h 8m 9s

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