Merge branch '276188-enable-query-cache-for-load-balancer-by-default' into 'master'

Enable query_cache_for_load_balancer feature flag by default

See merge request gitlab-org/gitlab!49708

ee/changelogs/unreleased/276188-enable-query-cache-for-load-balancer-by-default.yml

+---
+title: Enable query cache for load balancer
+merge_request: 49708
+author:
+type: performance

ee/config/feature_flags/development/query_cache_for_load_balancing.yml

@@ -5,4 +5,4 @@ rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/276203
 milestone: '13.7'
 type: development
 group: group::memory
-default_enabled: false
+default_enabled: true

ee/lib/gitlab/database/load_balancing/load_balancer.rb

@@ -190,7 +190,7 @@ module Gitlab
 
           RequestStore[ENSURE_CACHING_KEY] = true
 
-          if Feature.enabled?(:query_cache_for_load_balancing)
+          if Feature.enabled?(:query_cache_for_load_balancing, default_enabled: true)
             host.enable_query_cache!
           end
         end