AI Proofread: Fix highlight on formatted texts

[renatoagds]

Fixes #38521

Proposed changes:

• Add utility to get closest element that has data-type.

Other information:

• Have you written new tests for your changes, if applicable?
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Jetpack product discussion

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Does this pull request change what data or activity we track or use?

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Testing instructions:

• Enable Breve.
• Go to your editor.
• Format texts (bold, italic, etc).
• Highlight should work normally on these words.

[github-actions]

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[github-actions]

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[lhkowalski]

Working as expected.

Before the fix, the popover would not show the proper suggestion type on formatted text:

.

After this fix, I can see the proper suggestion type:

When one word is formatted on a larger suggestion	When the whole suggestion is formatted