fix: send confirmation email on re-adding agent (#5279)

Send confirmation email after re-adding the agent.

Fixes: #4951

spec/mailers/confirmation_instructions_spec.rb

@@ -11,6 +11,7 @@ RSpec.describe 'Confirmation Instructions', type: :mailer do
 
     before do
       # to verify the token in email
+      confirmable_user.update!(confirmed_at: nil)
       confirmable_user.send(:generate_confirmation_token)
     end
 
@@ -61,5 +62,17 @@ RSpec.describe 'Confirmation Instructions', type: :mailer do
         expect(confirmable_user.unconfirmed_email.blank?).to be false
       end
     end
+
+    context 'when user already confirmed' do
+      before do
+        confirmable_user.confirm
+        confirmable_user.account_users.last.destroy!
+      end
+
+      it 'send instructions with the link to login' do
+        confirmation_mail = Devise::Mailer.confirmation_instructions(confirmable_user.reload, nil, {})
+        expect(confirmation_mail.body).to include('/auth/sign_in')
+      end
+    end
   end
 end