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Description
This PR moves the "side inserter" to the block controls popover.
It also consistently places it on the right side. Currently we place it on the right side on mobile and in nested context, but on the left on wide screens if the block is at the root. See #19045 (comment).
Either we should consistently place it on the right side, or we could consider moving it to the left side but within the block boundary. I picked the first option because we're already doing that on mobile and for nested paragraphs. If needed, we can explore the inside-left option separately.
How has this been tested?
Screenshots
Types of changes
Checklist: