Turn fork_project_form feature flag default on

Issue: https://gitlab.com/gitlab-org/gitlab/-/issues/321387

app/controllers/projects/forks_controller.rb

@@ -17,7 +17,7 @@ class Projects::ForksController < Projects::ApplicationController
   feature_category :source_code_management
 
   before_action do
-    push_frontend_feature_flag(:fork_project_form)
+    push_frontend_feature_flag(:fork_project_form, @project, default_enabled: :yaml)
   end
 
   def index

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

 - page_title s_("ForkProject|Fork project")
 
-- if Feature.enabled?(:fork_project_form)
+- if Feature.enabled?(:fork_project_form, @project, default_enabled: :yaml)
   #fork-groups-mount-element{ data: { fork_illustration: image_path('illustrations/project-create-new-sm.svg'),
     endpoint: new_project_fork_path(@project, format: :json),
     new_group_path: new_group_path,

config/feature_flags/development/fork_project_form.yml

@@ -5,4 +5,4 @@ rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/321387
 milestone: '13.10'
 type: development
 group: group::source code
-default_enabled: false
+default_enabled: true