[FX-4635] Fix data-private type

[mkrl]

FX-4635

Description

There was a mistake in #4056, data-private is boolean, not string

How to test

• Temploy
• FIXME: Add the steps describing how to verify your changes

Development checks

• Add changeset according to guidelines (if needed)
• Read CONTRIBUTING.md and Component API principles
• Make sure that additions and changes on the design follow Toptal's BASE design, and it's been already discussed with designers at #-base-core
• Annotate all props in component with documentation
• Create examples for component
• Ensure that deployed demo has expected results and good examples
• Ensure the changed/created components have not caused accessibility issues. How to use accessibility plugin in storybook.
• Self reviewed
• Covered with tests (visual tests included)

Breaking change

• codemod is created and showcased in the changeset
• test alpha package of Picasso in StaffPortal

All development checks should be done and set checked to pass the
GitHub Bot: TODOLess action

PR commands

List of available commands:

• @toptal-bot run package:alpha-release - Release alpha version
• @toptal-anvil ping reviewers - Ping FX team for review

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[changeset-bot]

🦋 Changeset detected

Latest commit: f89b48c

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@toptal/picasso	Patch
@toptal/picasso-shared	Patch

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