Remove the initial margin from dropdown/popover in favor of Popper

Created by: rohit2sharma95

Set the default margin to 0 to override the ul's margin. And add the required space (distance) in Popper's offset.

For the static dropdowns add the margin using CSS after it is shown (To make sure if it was using Popper, data-popper-placement has been added)

Fixes #32379 (closed)