Update allowed docs versions and add backfill workflow #6285

Job	Run time
build_windows (3.10)	8m 35s
build_linux (3.12)	5m 38s
build_linux (3.14)	5m 51s
build_linux (3.11)	5m 24s
build_linux (3.13)	5m 49s
build_windows (3.12)	7m 46s
build_linux (3.10)	5m 32s
build_windows (3.11)	9m 52s
build_windows (3.13)	10m 40s
build_windows (3.14)	10m 5s
test_examples_linux (3.11, false, ubuntu-latest)	5m 9s
test_linux (3.12, false, ubuntu-latest)	3m 7s
test_linux (3.14, false, ubuntu-latest)	2m 43s
test_linux (3.10, false, ubuntu-latest)	2m 40s
test_linux (3.13, false, ubuntu-latest)	2m 43s
test_linux (3.11, false, ubuntu-latest)	2m 44s
upload_linux	0s
test_windows (3.12, false, windows-latest)	3m 38s
test_windows (3.13, false, windows-latest)	3m 6s
test_windows (3.11, false, windows-latest)	3m 44s
test_windows (3.14, false, windows-latest)	3m 15s
test_windows (3.10, false, windows-latest)	3m 48s
upload_windows	0s
Clean up anaconda packages	0s
	1h 51m 49s

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