Merge parent compass-ui button migration into stacked admin console branch

Bring in stylelint properties-order fixes from parent.

Co-authored-by: Matthew Birtch <mattbirtch@gmail.com>

webapp/channels/src/sass/components/_multi-select.scss

@@ -4,8 +4,8 @@
     min-height: 40px;
     align-items: center;
     justify-content: space-between;
-    gap: 8px;
     padding: 0 15px;
+    gap: 8px;
 
     // Target the submit control directly: compass-ui Button no longer has Bootstrap .btn
     > button {

webapp/channels/src/sass/routes/_backstage.scss

@@ -311,10 +311,10 @@
 
 .backstage-form__footer {
     display: flex;
+    overflow: hidden;
     flex-wrap: wrap;
     align-items: center;
     justify-content: flex-end;
-    overflow: hidden;
     padding-top: 1.8em;
     border-top: 1px solid variables.$light-gray;
     margin-top: 2.5em;