stacks: don't always early abort on the first plan

internal/stacks/stackruntime/internal/stackeval/component.go

@@ -269,7 +269,9 @@ func (c *Component) PlanIsComplete(ctx context.Context) bool {
 			return false
 		}
 
-		return plan.Complete
+		if !plan.Complete {
+			return false
+		}
 	}
 	// If we get here without returning false then we can say that
 	// all of the instance plans are complete.