Removed reference to monaco_blobs

We do not need to load ace library at all now.

app/views/projects/blob/edit.html.haml

 - breadcrumb_title _("Repository")
 - page_title _("Edit"), @blob.path, @ref
-- unless Feature.enabled?(:monaco_blobs)
-  - content_for :page_specific_javascripts do
-    = page_specific_javascript_tag('lib/ace.js')
 
 - if @conflict
   .alert.alert-danger

app/views/projects/blob/new.html.haml

 - breadcrumb_title _("Repository")
 - page_title _("New File"), @path.presence, @ref
-- unless Feature.enabled?(:monaco_blobs)
-  - content_for :page_specific_javascripts do
-    = page_specific_javascript_tag('lib/ace.js')
 
 .editor-title-row
   %h3.page-title.blob-new-page-title

changelogs/unreleased/198611-monaco_blobs-on-by-default.yml

+---
+title: Enabled monaco_blobs FF by default
+merge_request: 39441
+author:
+type: changed

lib/gitlab/gon_helper.rb

@@ -43,7 +43,7 @@ module Gitlab
       # Initialize gon.features with any flags that should be
       # made globally available to the frontend
       push_frontend_feature_flag(:snippets_vue, default_enabled: true)
-      push_frontend_feature_flag(:monaco_blobs, default_enabled: false)
+      push_frontend_feature_flag(:monaco_blobs, default_enabled: true)
       push_frontend_feature_flag(:monaco_ci, default_enabled: false)
       push_frontend_feature_flag(:snippets_edit_vue, default_enabled: false)
       push_frontend_feature_flag(:webperf_experiment, default_enabled: false)