Cleanup dead code #11607

Job	Run time
Example scripts (ubuntu-latest / Python 3.12)	7m 43s
Example notebooks (ubuntu-latest / Python 3.12)	11m 33s
Doctests (ubuntu-latest / Python 3.11)	4m 18s
Tests (ubuntu-latest / Python 3.9)	25m 37s
style	23s
Tests (ubuntu-latest / Python 3.10)	25m 43s
Tests (ubuntu-latest / Python 3.11)	21m 11s
Tests (ubuntu-latest / Python 3.12)	26m 23s
Tests (macos-13 / Python 3.9)	31m 4s
Tests (macos-13 / Python 3.10)	29m 33s
Tests (macos-13 / Python 3.11)	35m 42s
Tests (macos-13 / Python 3.12)	28m 10s
Tests (macos-14 / Python 3.9)	12m 4s
Tests (macos-14 / Python 3.10)	14m 19s
Tests (macos-14 / Python 3.11)	13m 58s
Tests (macos-14 / Python 3.12)	10m 1s
Tests (windows-latest / Python 3.9)	37m 46s
Tests (windows-latest / Python 3.10)	30m 18s
Tests (windows-latest / Python 3.11)	26m 1s
Tests (windows-latest / Python 3.12)	21m 42s
	6h 53m 29s

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