fix(object-widget): highlight nested validation errors

[domcleal]

Summary

When building nested controls for fields in an object widget, ensure the object's ID is passed through as a 'parent' so that errors in nested fields can be linked to the parent.

This ensures that a validation error on a field within an object will "bubble up" and show an error on a collapsed object's control in the editor, helping users to identify where there are validation errors.

Test plan

1. Open the demo site
2. Create a new Kitchen Sink collection entry
3. Enter something for the title, click Save
4. Scroll down to check the "Object" editor control and check if it's highlighted red

Before:

After:

Checklist

• I have read the contribution guidelines.