Add recaptcha to the forgot password page (#8849)

Author: drewgillies

src/NuGetGallery/Controllers/UsersController.cs

@@ -624,6 +624,7 @@ public virtual ActionResult ForgotPassword()
 
         [HttpPost]
         [ValidateAntiForgeryToken]
+        [ValidateRecaptchaResponse]
         public virtual async Task<ActionResult> ForgotPassword(ForgotPasswordViewModel model)
         {
             // We don't want Login to have us as a return URL

src/NuGetGallery/Views/Users/ForgotPassword.cshtml

@@ -33,10 +33,14 @@
                         @Html.ShowValidationMessagesForEmpty()
                     </div>
                     <div class="form-group">
-                        <input type="submit" class="btn btn-primary form-control" value="Send" />
+                        <input id="Submit" type="submit" class="btn btn-primary form-control" value="Send" />
                     </div>
                 }
             </div>
         </div>
     </div>
-</section>
+</section>
+
+@section BottomScripts {
+    @ViewHelpers.RecaptchaScripts(Config.Current.ReCaptchaPublicKey, "Submit")
+}