Only reindex documents if declarations are being modified #11935

Job	Run time
build_node (ubuntu-latest)	2m 6s
Ruby 3.1 on ubuntu-latest	11m 48s
build_node (macos-latest)	2m 51s
lint_node	33s
Ruby 3.2 on ubuntu-latest	10m 18s
build_node (windows-latest)	9m 17s
Ruby 3.3 on ubuntu-latest	9m 50s
Ruby 3.1 on macos-latest	8m 2s
lint_ruby	26s
Ruby 3.2 on macos-latest	6m 37s
spelling	17s
Ruby 3.3 on macos-latest	5m 58s
Verify Jekyll website builds	8s
Ruby 3.1 on windows-latest	22m 12s
Ruby 3.2 on windows-latest	20m 48s
Ruby 3.3 on windows-latest	22m 29s
	2h 13m 40s

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