Add LSP launcher #11085

Job	Run time
build_node (ubuntu-latest)	1m 13s
lint_ruby	26s
lint_node	48s
build_node (macos-latest)	1m 25s
Ruby 3.1 on ubuntu-latest	15m 21s
Ruby 3.2 on ubuntu-latest	15m 27s
build_node (windows-latest)	4m 30s
Verify Jekyll website builds	8s
Ruby 3.3 on ubuntu-latest	11m 7s
Ruby 3.1 on macos-latest	8m 40s
Ruby 3.2 on macos-latest	8m 18s
Ruby 3.3 on macos-latest	6m 45s
Ruby 3.1 on windows-latest	20m 43s
Ruby 3.2 on windows-latest	20m 11s
Ruby 3.3 on windows-latest	22m 51s
	2h 17m 53s

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