Fix: Prevent undefined properties at the root level

[heath-freenome]

Reasons for making this change

Fixes: #3424 by preventing the inclusion of undefined properties at the root level

• Updated @rjsf/utils, making computeDefaults() helper in getDefaultFormState() to skip adding undefined values when allowEmptyObject is set.
  • Updated the getDefaultFormState() definition in the ValidatorType to add this new option
  • Updated the tests accordingly
• Updated @rjsf/core, switching the excludeObjectChildren with allowEmptyObject in Form
• Updated the documentation for getDefaultFormState() to add this new option
• Updated the CHANGELOG.md accordingly
  • Also added information the changelog for PR Add "list-inline-item" as a class name on LI elements in the AltDateWidget #3202

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

[nickgros]

Instead of inlining this can we set it before L210?

          const nestedIncludeUndefinedValues = passAsFalseForIncludeUndefinedValues.includes(
              includeUndefinedValues
            )
              ? false
              : includeUndefinedValues
          // Compute the defaults for this node, with the parent defaults we might
          // have from a previous run: defaults[key].
          const computedDefault = computeDefaults<T, S, F>(
            validator,
            get(schema, [PROPERTIES_KEY, key]),
            get(defaults, [key]),
            rootSchema,
            get(formData, [key]),
            nestedIncludeUndefinedValues
          );

Also, couldn't

passAsFalseForIncludeUndefinedValues.includes(includeUndefinedValues) ? false : includeUndefinedValues

be simplified to this?

includeUndefinedValues === true

[heath-freenome]

Yes, yes it could. Great simplification