Add an oauth provider path helper.

The helper constructs the path for a given oauth provider since Devise 4.0 deprecated passing the provider to the omniauth authentication path.

Fixes #18110.

app/controllers/sessions_controller.rb

@@ -101,7 +101,7 @@ class SessionsController < Devise::SessionsController
     # Prevent alert from popping up on the first page shown after authentication.
     flash[:alert] = nil
 
-    redirect_to user_omniauth_authorize_path(provider.to_sym)
+    redirect_to provider_path(provider)
   end
 
   def valid_otp_attempt?(user)

app/helpers/auth_helper.rb

@@ -60,6 +60,12 @@ module AuthHelper
     end
   end
 
+  # Constructs the OAuth provider path.
+  # For example: user_google_omniauth_authorize_path
+  def provider_path(provider)
+    send("user_#{provider.underscore}_omniauth_authorize_path")
+  end
+
   def auth_active?(provider)
     current_user.identities.exists?(provider: provider.to_s)
   end

app/views/devise/sessions/_new_crowd.html.haml

-= form_tag(user_omniauth_authorize_path("crowd"), id: 'new_crowd_user' ) do
+= form_tag(provider_path("crowd"), id: 'new_crowd_user' ) do
   = text_field_tag :username, nil, {class: "form-control top", placeholder: "Username", autofocus: "autofocus"}
   = password_field_tag :password, nil, {class: "form-control bottom", placeholder: "Password"}
   - if devise_mapping.rememberable?

app/views/devise/shared/_omniauth_box.html.haml

@@ -5,4 +5,4 @@
   - providers.each do |provider|
     %span.light
       - has_icon = provider_has_icon?(provider)
-      = link_to provider_image_tag(provider), user_omniauth_authorize_path(provider), method: :post, class: (has_icon ? 'oauth-image-link' : 'btn'), "data-no-turbolink" => "true"
+      = link_to provider_image_tag(provider), provider_path(provider), method: :post, class: (has_icon ? 'oauth-image-link' : 'btn'), "data-no-turbolink" => "true"

app/views/profiles/accounts/show.html.haml

@@ -70,7 +70,7 @@
               = link_to unlink_profile_account_path(provider: provider), method: :delete, class: 'provider-btn' do
                 Disconnect
           - else
-            = link_to user_omniauth_authorize_path(provider), method: :post, class: 'provider-btn not-active', "data-no-turbolink" => "true" do
+            = link_to provider_path(provider), method: :post, class: 'provider-btn not-active', "data-no-turbolink" => "true" do
               Connect
   %hr
 - if current_user.can_change_username?