Remove format should include formatted content inside table cells and other nested editable elements.

[niegowski]

🚀 Summary

Remove format should include formatted content inside table cells and other nested editable elements.

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📌 Related issues

• Closes Remove format fails to remove nested table styles even though it removes styles from nested table cells #18800.
• Closes Remove Format used with GHS fails to remove styles from block elements inside a table when part of a wider selection #18794.

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💡 Additional information

Optional: Notes on decisions, edge cases, or anything helpful for reviewers.