squash! squash! Check that a promotion isn't invoked repeatedly

This replaces the check that the target env is running the latest
revision, with a check that the promotion has been triggered. We may
in practice want to do both -- perhaps some other process noticed the
promotion was pending, and effected it.

controllers/leveltriggered/controller.go

@@ -345,16 +345,6 @@ func (r *PipelineReconciler) promoteLatestRevision(ctx context.Context, pipeline
 	return err
 }
 
-func checkAnyTargetHasRevision(env *v1alpha1.EnvironmentStatus, revision string) bool {
-	for _, target := range env.Targets {
-		if target.Revision == revision {
-			return true
-		}
-	}
-
-	return false
-}
-
 func checkAllTargetsRunRevision(env *v1alpha1.EnvironmentStatus, revision string) bool {
 	for _, target := range env.Targets {
 		if target.Revision != revision {