Remove the initial margin from dropdown/popover in favor of Popper (#32524)

* Remove the margin from dropdown in favor of Popper

- Set the default margin to 0 for dropdowns (To remove the Popper's  warning)
- Set the required offset in dropdown's defaults

* Remove the margin from the popover component

Co-authored-by: XhmikosR <xhmikosr@gmail.com>

js/src/popover.js

@@ -25,6 +25,7 @@ const BSCLS_PREFIX_REGEX = new RegExp(`(^|\\s)${CLASS_PREFIX}\\S+`, 'g')
 const Default = {
   ...Tooltip.Default,
   placement: 'right',
+  offset: [0, 8],
   trigger: 'click',
   content: '',
   template: '<div class="popover" role="tooltip">' +