add animation before setting exit time

fixes #7728
This fix is not necessary now that we have the renderer in the editor, since nested artboards run in c++.
But since I was looking into it, and just in case, I added the fix on the flutter runtime.

Diffs=
1b6afc1e9 add animation before setting exit time (#7729)

Co-authored-by: hernan <hernan@rive.app>

.rive_head

@@ -1 +1 @@
-c3137b923ca5d62771f85dcae10afcba6de083d3
+1b6afc1e96b6cac3a708b78381ce6fa7d0dd8058

lib/src/core/importers/layer_state_importer.dart

@@ -19,6 +19,7 @@ class LayerStateImporter extends ArtboardImportStackObject {
     // animations.
     if (state is BlendState) {
       var blendState = state as BlendState;
+      blendState.internalAddAnimation(blendAnimation);
       for (final transition
           in state.transitions.whereType<BlendStateTransition>()) {
         if (transition.exitBlendAnimationId >= 0 &&
@@ -27,9 +28,6 @@ class LayerStateImporter extends ArtboardImportStackObject {
               blendState.animations[transition.exitBlendAnimationId];
         }
       }
-    }
-    if (state is BlendState) {
-      (state as BlendState).internalAddAnimation(blendAnimation);
       return true;
     }