Clean up legacy extension imports #3

Job	Run time
Docs, Examples, and Eval	15m 31s
Docs, Examples, and Eval	15m 31s
Conda Python 3.10 on macos	6m 42s
Conda Python 3.10 on macos	6m 42s
Conda Python 3.10 on windows	8m 43s
Conda Python 3.10 on windows	8m 43s
Minimal Supported Dependencies	10m 20s
Minimal Supported Dependencies	10m 20s
Conda Python 3.10 on ubuntu	12m 56s
Conda Python 3.10 on ubuntu	12m 56s
Vanilla Python 3.10 on windows	12m 25s
Vanilla Python 3.10 on windows	12m 25s
Conda Python 3.11 on macos	7m 43s
Conda Python 3.11 on macos	7m 43s
Vanilla Python 3.10 on ubuntu	30m 1s
Vanilla Python 3.10 on ubuntu	8m 42s
Conda Python 3.11 on windows	7m 34s
Conda Python 3.11 on windows	7m 34s
Vanilla Python 3.11 on windows	13m 5s
Vanilla Python 3.11 on windows	13m 5s
Conda Python 3.11 on ubuntu	13m 7s
Conda Python 3.11 on ubuntu	13m 7s
Vanilla Python 3.11 on ubuntu	11m 29s
Vanilla Python 3.11 on ubuntu	11m 29s
Test Suite Results	0s
Test Suite Results	14s
	4h 38m 7s

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