Enable CI visualization by default

This enables the Ci visualization by default
and updates the doc to reflect it.

app/controllers/projects/ci/pipeline_editor_controller.rb

@@ -3,7 +3,7 @@
 class Projects::Ci::PipelineEditorController < Projects::ApplicationController
   before_action :check_can_collaborate!
   before_action do
-    push_frontend_feature_flag(:ci_config_visualization_tab, @project, default_enabled: false)
+    push_frontend_feature_flag(:ci_config_visualization_tab, @project, default_enabled: :yaml)
   end
 
   feature_category :pipeline_authoring

changelogs/unreleased/ff-enable-ci-vis-by_-default.yml

+---
+title: Enable CI visualization by default
+merge_request: 51701
+author:
+type: added

config/feature_flags/development/ci_config_visualization_tab.yml

@@ -5,4 +5,4 @@ rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/290117
 milestone: '13.7'
 type: development
 group: group::pipeline authoring
-default_enabled: false
+default_enabled: true

doc/ci/pipeline_editor/index.md

@@ -59,8 +59,9 @@ reflected in the CI lint. It displays the same results as the existing [CI Lint
 
 > - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/241722) in GitLab 13.5.
 > - [Moved to **CI/CD > Editor**](https://gitlab.com/gitlab-org/gitlab/-/issues/263141) in GitLab 13.7.
-> - It's [deployed behind a feature flag](../../user/feature_flags.md), disabled by default.
-> - It's disabled on GitLab.com.
+> - It was [deployed behind a feature flag](../../user/feature_flags.md), disabled by default.
+> - [Became enabled by default](https://gitlab.com/gitlab-org/gitlab/-/issues/290117) in GitLab 13.8.
+> - It's enabled on GitLab.com.
 > - It's not recommended for production use.
 > - To use it in GitLab self-managed instances, ask a GitLab administrator to [enable it](#enable-or-disable-cicd-configuration-visualization). **(CORE ONLY)**
 
@@ -82,21 +83,21 @@ each job depends only on the previous stage being completed successfully.
 
 ### Enable or disable CI/CD configuration visualization **(CORE ONLY)**
 
-CI/CD configuration visualization is under development and not ready for production use. It is
-deployed behind a feature flag that is **disabled by default**.
+CI/CD configuration visualization is under development but ready for production use.
+It is deployed behind a feature flag that is **enabled by default**.
 [GitLab administrators with access to the GitLab Rails console](../../administration/feature_flags.md)
-can enable it.
+can opt to disable it.
 
-To enable it:
+To disable it:
 
 ```ruby
-Feature.enable(:ci_config_visualization_tab)
+Feature.disable(:ci_config_visualization_tab)
 ```
 
-To disable it:
+To enable it:
 
 ```ruby
-Feature.disable(:ci_config_visualization_tab)
+Feature.enable(:ci_config_visualization_tab)
 ```
 
 ## Commit changes to CI configuration