Add LiT CI job and runner cleanup action #2776

Job	Run time
go mod check	11m 58s
RPC compilation check	1m 53s
SQL compilation check	11s
verify that auto-generated documentation is up-to-date	30s
build and lint code	5m 4s
run unit-test postgres race	10m 13s
run LiT itests	13m 12s
run unit-test race	9m 36s
run LiT unit tests	5m 1s
	57m 38s

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