ci: make workflow to verify samples, list all subdirs #634

Job	Run time
Java tests (swift:6.1.2 jdk:Corretto os:jammy)	4m 37s
Swift tests (swift:6.1.2 jdk:Corretto os:jammy)	4m 37s
verify-samples / construct-samples-matrix	4s
soundness / Documentation check	36s
soundness / License headers check	5s
soundness / Unacceptable language check	3s
soundness / Broken symlinks check	3s
soundness / YAML lint check	4s
soundness / Shell check	31s
soundness / Python lint check	7s
soundness / API breakage check	-1s
soundness / Format check	-1s
	10m 45s

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