Merge branch 'sc1-fix-etag-cache-middleware-order' into 'master'

Move etag caching middleware after rack middleware

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/127368



Merged-by: Bojan Marjanovic <bmarjanovic@gitlab.com>
Approved-by: Gregorius Marco <gmarco@gitlab.com>
Approved-by: Bojan Marjanovic <bmarjanovic@gitlab.com>
Reviewed-by: Bojan Marjanovic <bmarjanovic@gitlab.com>
Reviewed-by: Gregorius Marco <gmarco@gitlab.com>
Co-authored-by: Sylvester Chin <schin@gitlab.com>

config/initializers/zz_metrics.rb

@@ -23,6 +23,9 @@
     config.middleware.insert_before Gitlab::Database::LoadBalancing::RackMiddleware,
                                    Gitlab::Middleware::RailsQueueDuration
 
+    config.middleware.move_after Gitlab::Metrics::RackMiddleware,
+      Gitlab::EtagCaching::Middleware
+
     config.middleware.use(Gitlab::Metrics::ElasticsearchRackMiddleware)
   end