Fix: Programmatic required error does not work as expected on the toggle control

[jorgefilipecosta]

Fixes an issue reported by @oandregal where on toggle control the programmatic errors don't work as expected.
The cause was a timing bug where the Toggle field's validation error was not displayed after opening a previously collapsed card, even though the badge correctly showed the field count.
The solution was to change useEffect to useLayoutEffect in ValidatedToggleControl so the required attribute is set on the input before ControlWithError's effect reads validationMessage

Testing

• Open Storybook at ?path=/story/dataviews-dataform--validation&args=layout:card-collapsible
• Open the "Boolean Fields" card, then close it — badge shows "2 fields need attention"
• Reopen the card — verify the Toggle error message now appears (on trunk it does not)
• Verify checkbox and toggle group errors still display correctly
• Toggle the control on/off to confirm it still functions

[github-actions]

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Co-authored-by: jorgefilipecosta <jorgefilipecosta@git.wordpress.org>
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[github-actions]

Flaky tests detected in df5afe4.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/21371001426
📝 Reported issues:

• [Flaky Test] should hide a block completely by selecting "Omit from published content" #74883 in /test/e2e/specs/editor/various/block-hiding.spec.js

[SirLouen]

Using useLayoutEffect for this feels a bit like a step backwards.

✅ I have tested it, and it's clearly solving this, but my question is:

Why don't we get to the root of the problem with the required not being passed?

I'm proposing an alternative here #74956 feel free to comment, I've recently started to dig in DataViews/DataForms so maybe I don't have full context.

[jorgefilipecosta]

Thank you for the alternative fix @SirLouen, it seems a better solution I'm going to close this PR in favor of #74956.