Ensure we index non test files under test directories #13089

Job	Run time
build_node (ubuntu-latest)	2m 4s
Ruby 3.1 on ubuntu-latest	14m 23s
build_node (macos-latest)	2m 30s
lint_node	29s
build_node (windows-latest)	7m 37s
Ruby 3.2 on ubuntu-latest	12m 5s
lint_ruby	34s
Ruby 3.3 on ubuntu-latest	10m 38s
spelling	14s
Ruby 3.4 on ubuntu-latest	11m 28s
Verify Jekyll website builds	11s
Ruby 3.1 on macos-latest	9m 6s
Ruby 3.2 on macos-latest	7m 15s
Ruby 3.3 on macos-latest	7m 37s
Ruby 3.4 on macos-latest	7m 6s
Ruby 3.1 on windows-latest	23m 46s
Ruby 3.2 on windows-latest	24m 20s
Ruby 3.3 on windows-latest	25m 0s
Ruby 3.4 on windows-latest	26m 54s
	3h 13m 17s

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