Update allowed docs versions and add backfill workflow #6286

Job	Run time
build_windows (3.12)	8m 21s
build_linux (3.10)	5m 33s
build_linux (3.14)	5m 59s
build_linux (3.12)	5m 33s
build_linux (3.13)	6m 41s
build_linux (3.11)	5m 19s
build_windows (3.13)	8m 40s
build_windows (3.10)	8m 24s
build_windows (3.14)	8m 20s
build_windows (3.11)	9m 9s
test_examples_linux (3.11, false, ubuntu-latest)	5m 24s
test_linux (3.13, false, ubuntu-latest)	2m 54s
test_linux (3.11, false, ubuntu-latest)	2m 40s
test_linux (3.12, false, ubuntu-latest)	3m 49s
test_linux (3.14, false, ubuntu-latest)	2m 40s
test_linux (3.10, false, ubuntu-latest)	3m 18s
test_windows (3.13, false, windows-latest)	3m 5s
test_windows (3.14, false, windows-latest)	4m 0s
test_windows (3.11, false, windows-latest)	5m 21s
test_windows (3.10, false, windows-latest)	3m 55s
test_windows (3.12, false, windows-latest)	3m 59s
upload_linux	0s
Clean up anaconda packages	0s
upload_windows	0s
	1h 53m 4s

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