EE: PLT-4512 Show secret in addition to QR code when activating MFA (#4427)

* EE: Update MFA to display secret for manual entry

* Width adjustments for secret (#4423)

* Add unit test

webapp/actions/user_actions.jsx

@@ -316,3 +316,20 @@ export function autocompleteUsersInTeam(username, success, error) {
         }
     );
 }
+
+export function generateMfaSecret(success, error) {
+    Client.generateMfaSecret(
+        (data) => {
+            if (success) {
+                success(data);
+            }
+        },
+        (err) => {
+            AsyncClient.dispatchError(err, 'generateMfaSecret');
+
+            if (error) {
+                error(err);
+            }
+        }
+    );
+}