Add LiT CI job and runner cleanup action #2773

Job	Run time
RPC compilation check	1m 44s
go mod check	11m 34s
SQL compilation check	7s
build and lint code	4m 54s
run unit tests	18m 47s
verify that auto-generated documentation is up-to-date	35s
run LiT unit tests	3m 24s
	41m 5s

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