This change restores only the margin and padding styles for the `.update-message` class when used by plugins in the context of adding arbitrary rows to the list table. The inline-update colors and icon styles were not restored, expressly with a wide variety of plugin use-cases in mind.
Merge of [38237] to the 4.6 branch.
Props ovann86, rahulsprajapati, ocean90, DrewAPicture.
Props helen for review.
Fixes#37504.
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