JwtController avoids activating session checks

This used without a session and issues a sessionless token, so we
should avoid causing access checks based on the session.

app/controllers/jwt_controller.rb

 # frozen_string_literal: true
 
 class JwtController < ApplicationController
+  skip_around_action :set_session_storage
   skip_before_action :authenticate_user!
   skip_before_action :verify_authenticity_token
   before_action :authenticate_project_or_user

spec/requests/jwt_controller_spec.rb

@@ -108,6 +108,14 @@ describe JwtController do
           end
         end
       end
+
+      it 'does not cause session based checks to be activated' do
+        expect(Gitlab::Session).not_to receive(:with_session)
+
+        get '/jwt/auth', params: parameters, headers: headers
+
+        expect(response).to have_gitlab_http_status(200)
+      end
     end
 
     context 'using invalid login' do