feat(dropdown): add hideLabel prop

docs/src/COMPONENT_API.json

@@ -3858,6 +3858,16 @@
           "constant": false,
           "reactive": false
         },
+        {
+          "name": "hideLabel",
+          "kind": "let",
+          "description": "Set to `true` to visually hide the label text",
+          "type": "boolean",
+          "value": "false",
+          "isFunction": false,
+          "constant": false,
+          "reactive": false
+        },
         {
           "name": "translateWithId",
           "kind": "let",

docs/src/pages/components/Dropdown.svx

@@ -13,6 +13,12 @@ components: ["Dropdown", "DropdownSkeleton"]
   {id: "1", text: "Email"},
   {id: "2", text: "Fax"}]}" />
 
+### Hidden label
+
+<Dropdown hideLabel titleText="Contact" selectedIndex={0} items="{[{id: "0", text: "Slack"},
+  {id: "1", text: "Email"},
+  {id: "2", text: "Fax"}]}" />
+
 ### Format item display text
 
 Use the `itemToString` prop to format the display of individual items.