Update allowed docs versions and add backfill workflow #6270

Job	Run time
build_windows (3.11)	8m 46s
build_linux (3.14)	6m 9s
build_linux (3.11)	6m 33s
build_windows (3.12)	7m 48s
build_linux (3.10)	6m 42s
build_windows (3.13)	8m 58s
build_linux (3.13)	5m 51s
build_linux (3.12)	9m 12s
build_windows (3.14)	7m 46s
build_windows (3.10)	8m 18s
test_windows (3.12, false, windows-latest)	3m 6s
test_windows (3.13, false, windows-latest)	3m 59s
test_windows (3.11, false, windows-latest)	3m 57s
test_windows (3.10, false, windows-latest)	4m 9s
test_windows (3.14, false, windows-latest)	3m 9s
test_examples_linux (3.11, false, ubuntu-latest)	5m 6s
test_linux (3.13, false, ubuntu-latest)	2m 43s
test_linux (3.11, false, ubuntu-latest)	2m 55s
test_linux (3.10, false, ubuntu-latest)	3m 21s
test_linux (3.12, false, ubuntu-latest)	3m 4s
test_linux (3.14, false, ubuntu-latest)	3m 6s
upload_linux	0s
upload_windows	0s
Clean up anaconda packages	0s
	1h 54m 38s

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