Add user documentation for the new test explorer #14497

Job	Run time
lint_ruby	33s
lint_ruby	33s
spelling	14s
spelling	14s
build_node (ubuntu-latest)	2m 23s
build_node (ubuntu-latest)	2m 17s
Ruby 3.1 on ubuntu-latest	11m 32s
Ruby 3.1 on ubuntu-latest	11m 32s
lint_node	36s
lint_node	36s
build_node (macos-latest)	2m 43s
build_node (macos-latest)	2m 43s
Ruby 3.2 on ubuntu-latest	11m 7s
Ruby 3.2 on ubuntu-latest	11m 7s
build_node (windows-latest)	5m 56s
build_node (windows-latest)	5m 56s
Ruby 3.3 on ubuntu-latest	10m 1s
Ruby 3.3 on ubuntu-latest	10m 1s
Verify Jekyll website builds	11s
Verify Jekyll website builds	11s
Ruby 3.4 on ubuntu-latest	11m 3s
Ruby 3.4 on ubuntu-latest	11m 3s
Ruby 3.1 on macos-latest	6m 25s
Ruby 3.1 on macos-latest	6m 25s
Ruby 3.2 on macos-latest	6m 38s
Ruby 3.2 on macos-latest	6m 38s
Ruby 3.3 on macos-latest	6m 25s
Ruby 3.3 on macos-latest	6m 25s
Ruby 3.4 on macos-latest	6m 36s
Ruby 3.4 on macos-latest	6m 36s
Ruby 3.1 on windows-latest	23m 38s
Ruby 3.1 on windows-latest	23m 38s
Ruby 3.2 on windows-latest	23m 33s
Ruby 3.2 on windows-latest	23m 33s
Ruby 3.3 on windows-latest	24m 8s
Ruby 3.3 on windows-latest	24m 8s
Ruby 3.4 on windows-latest	24m 33s
Ruby 3.4 on windows-latest	24m 33s
	5h 56m 24s

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