Add contextual suggestion for undoing a template part reset #54448
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Description
When resetting a template part we fire a snackbar notification with an "Undo" action. We should surface that as a contextual action within the command palette, if there are immediate changes to undo.
There is of course the "Undo" action in the header toolbar, but I think if you reset the template part from the command palette (#54447), then you'd expect to undo those changes as well.
The current notification:
Expected:
