DSC-2707 Removed arrow and replaced with double caret

Author: Mattia Vianelli

src/app/shared/form/builder/ds-dynamic-form-ui/ds-dynamic-form-control-container.component.scss

@@ -10,16 +10,11 @@
   height: fit-content;
 }
 
-:host ::ng-deep .form-select {
-  -webkit-appearance: none;
-  -moz-appearance: none;
-  appearance: none;
-  background-image: none !important;
-}
-
-// Hide Bootstrap's form-select background image arrow for ng-bootstrap components
-:host ::ng-deep dynamic-ng-bootstrap-select .form-select {
-  background-image: none !important;
+:host ::ng-deep .form-select, {
+  -webkit-appearance: none !important;
+  -moz-appearance: none !important;
+  appearance: none !important;
+  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' width='4' height='5' viewBox='0 0 4 5'%3e%3cpath fill='%23343a40' d='M2 0L0 2h4zm0 5L0 3h4z'/%3e%3c/svg%3e") !important;
 }
 
 :host ::ng-deep .btn-group-toggle > .btn input[type="radio"] {