Ensure we index non test files under test directories #13090

Job	Run time
build_node (ubuntu-latest)	1m 55s
lint_node	28s
build_node (macos-latest)	2m 3s
Ruby 3.1 on ubuntu-latest	14m 25s
lint_ruby	34s
build_node (windows-latest)	8m 41s
Ruby 3.2 on ubuntu-latest	12m 31s
spelling	14s
Verify Jekyll website builds	11s
Ruby 3.3 on ubuntu-latest	11m 55s
Ruby 3.4 on ubuntu-latest	10m 44s
Ruby 3.1 on macos-latest	11m 17s
Ruby 3.2 on macos-latest	7m 22s
Ruby 3.3 on macos-latest	7m 39s
Ruby 3.4 on macos-latest	6m 3s
Ruby 3.1 on windows-latest	22m 36s
Ruby 3.2 on windows-latest	24m 25s
Ruby 3.3 on windows-latest	24m 3s
Ruby 3.4 on windows-latest	27m 27s
	3h 14m 33s

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