UX: try select-kit autocomplete Chrome fix (#15752)

app/assets/javascripts/select-kit/addon/templates/components/select-kit/select-kit-filter.hbs

@@ -4,7 +4,7 @@
     tabindex=0
     class="filter-input"
     placeholder=placeholder
-    autocomplete="discourse"
+    autocomplete="off"
     autocorrect="off"
     autocapitalize="off"
     name="filter-input-search"
@@ -14,6 +14,7 @@
     paste=(action "onPaste")
     keyDown=(action "onKeydown")
     keyUp=(action "onKeyup")
+    type="search"
   }}
 
   {{#if selectKit.options.filterIcon}}

app/assets/stylesheets/common/base/discourse.scss

@@ -230,6 +230,14 @@ input {
   }
 }
 
+input[type="search"] {
+  &::-webkit-search-cancel-button,
+  &::-webkit-search-decoration {
+    -webkit-appearance: none;
+    appearance: none;
+  }
+}
+
 // Fixes Safari height inconsistency
 ::-webkit-datetime-edit {
   display: inline;