Add LiT CI job and runner cleanup action #2777

Job	Run time
SQL compilation check	8s
RPC compilation check	1m 35s
verify that auto-generated documentation is up-to-date	33s
build and lint code	5m 8s
run unit-test postgres race	10m 42s
run unit-test race	9m 12s
run LiT itests	12m 37s
go mod check	11m 34s
run LiT unit tests	4m 47s
	56m 16s

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