✨(app-desk) integrate multiselect search users

Integrate multiselect search users in the
modal add members.
We are using react-select to implement the
multiselect search users. We are using this
library in waiting for Cunningham to implement
the multiselect asynch component.

src/frontend/apps/desk/package.json

@@ -25,6 +25,7 @@
     "react-aria-components": "1.1.1",
     "react-dom": "18.2.0",
     "react-i18next": "14.1.0",
+    "react-select": "5.8.0",
     "styled-components": "6.1.8",
     "zustand": "4.5.2"
   },