MM-52613: Add icons to "Add channels" LHS menu (#23239)

webapp/channels/src/sass/layout/_sidebar-left.scss

@@ -743,6 +743,14 @@ $sidebarOpacityAnimationDuration: 0.15s;
     .AddChannelsCtaDropdown .dropdown-menu {
         min-width: 210px !important;
         margin-left: 20px;
+
+        .MenuItem button span {
+            color: rgba(var(--center-channel-color-rgb), 0.9);
+
+            i {
+                color: rgba(var(--center-channel-color-rgb), 0.72);
+            }
+        }
     }
 
     #introTextInvite,