Use promises version of getUsersByHostname

GitOrigin-RevId: c7b8be79436075a817e5f1429dbe41d824133141

services/web/app/src/Features/User/UserGetter.js

@@ -227,7 +227,10 @@ async function getInstitutionUsersByHostname(hostname) {
     samlIdentifiers: 1,
   }
 
-  const users = await UserGetter.getUsersByHostname(hostname, projection)
+  const users = await UserGetter.promises.getUsersByHostname(
+    hostname,
+    projection
+  )
   users.forEach(user => {
     user.emails = decorateFullEmails(
       user.email,