mesh-knowledge tests: set the local zone once before any goroutine, not under a running bus server (race found by the repository check on #237)

inZone wrote time.Local while the bus test's nats server read it from a
goroutine that outlives its test; the race detector the repository check
now runs failed TestAReviewOwedOutlivesARestartAndItsLastTryIsSaid.

modules/mesh-knowledge/cmd/mesh-knowledge/kit_test.go

@@ -40,6 +40,9 @@ func TestMain(m *testing.M) {
 		serve(k, os.Getenv("MESH_KNOWLEDGE_STATUS"))
 		os.Exit(0)
 	}
+	// Every test runs in a zone that is not UTC, so a time said locally is proven to be, wherever the tests run. It
+	// is set once, before any goroutine starts: a test that set it while a bus test's server read it raced.
+	time.Local = testZone
 	code := m.Run()
 	stopPostgres()
 	os.Exit(code)