fix: Fix #3391 and #3393

[heath-freenome]

Reasons for making this change

Fixes #3391 by adding the excludeObjectChildren third parameter to the main getDefaultFormState()
Fixes #3393 by properly deduplicating when schema.default exists in schema.examples

Checklist

• I'm updating documentation
  • I've checked the rendering of the Markdown text I've added
• I'm adding or updating code
  • I've added and/or updated tests. I've run npm run test:update to update snapshots, if needed.
  • I've updated docs if needed
  • I've updated the changelog with a description of the PR
• I'm adding a new feature
  • I've updated the playground with an example use of the feature