test(uat): assert aws lane train phase directly

The aggregate runsJourney("training", "train") check passes on gcp's
enabled train step even if the aws lane lost the phase, so assert
awsLane.phases["train"] directly to prove the aws pipeline runs it.

Signed-off-by: Nathan Hensley <nhensley@nvidia.com>

Author: njhensley

tools/coverage/build_test.go

@@ -285,6 +285,12 @@ func TestScanWiredUATFromRegistry(t *testing.T) {
 			t.Errorf("aws lane intents = %v, want the union to include %q", awsLane.intents, intent)
 		}
 	}
+	// And the aws pipeline actually runs the train phase — asserted on the lane
+	// itself, since the aggregate runsJourney("training", "train") below would
+	// pass on gcp's enabled train step even if the aws lane lost the phase.
+	if !awsLane.phases["train"] {
+		t.Errorf("aws lane phases = %v, want the enabled train phase", awsLane.phases)
+	}
 
 	// Both intents run somewhere, so both stacks are stood up nightly...
 	for _, intent := range []string{"training", "inference"} {