Enable ci_trace_new_fog_store feature flag by default

This has been enabled on GitLab.com with 0 failures in
BuildTraceChunkFlushWorker over the past few hours, so I think it is
safe to enable by default now. This will fix cloud native job logs for
Azure Blob storage.

Relates to https://gitlab.com/gitlab-org/gitlab/-/issues/273405

app/models/ci/build_trace_chunk.rb

@@ -80,7 +80,7 @@ module Ci
       end
 
       def fog_store_class
-        if Feature.enabled?(:ci_trace_new_fog_store)
+        if Feature.enabled?(:ci_trace_new_fog_store, default_enabled: true)
           Ci::BuildTraceChunks::Fog
         else
           Ci::BuildTraceChunks::LegacyFog

config/feature_flags/development/ci_trace_new_fog_store.yml

@@ -4,4 +4,4 @@ introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/46209
 rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/273405
 type: development
 group: group::testing
-default_enabled: false
+default_enabled: true