Fix `orch.getChain()` race #35998

Job	Run time
pre_check / Check preconditions and cancel previous jobs	4s
deployment-test	29m 53s
getting-started (link-cli/yarn)	10m 28s
getting-started (registry/yarn)	15m 58s
getting-started (registry/npm)	16m 46s
test-docker-build	23m 0s
getting-started (registry/npx)	15m 7s
test-multichain-e2e / multichain-e2e	35m 27s
finalize-integration-result	4s
	2h 26m 47s

Provide feedback