Enabled phabricator importer by default

changelogs/unreleased/kassio-phabricator-enabled-by-default.yml

+---
+title: Enabled phabricator importer by default
+merge_request: 56765
+author:
+type: added

config/feature_flags/development/phabricator_import.yml

@@ -5,4 +5,4 @@ rollout_issue_url: https://gitlab.com/groups/gitlab-org/-/epics/1197
 milestone: '12.0'
 type: development
 group: group::import
-default_enabled: false
+default_enabled: true

doc/user/project/import/phabricator.md

@@ -36,13 +36,4 @@ of the project being imported into, then the user will be linked.
 
 ## Enabling this feature
 
-While this feature is incomplete, a feature flag is required to enable it so that
-we can gain early feedback before releasing it for everyone. To enable it:
-
-1. Run the following command in a Rails console:
-
-   ```ruby
-   Feature.enable(:phabricator_import)
-   ```
-
-1. Enable Phabricator as an [import source](../../admin_area/settings/visibility_and_access_controls.md#import-sources) in the Admin Area.
+Enable Phabricator as an [import source](../../admin_area/settings/visibility_and_access_controls.md#import-sources) in the Admin Area.

lib/gitlab/phabricator_import.rb

@@ -5,7 +5,7 @@ module Gitlab
     BaseError = Class.new(StandardError)
 
     def self.available?
-      Feature.enabled?(:phabricator_import) &&
+      Feature.enabled?(:phabricator_import, default_enabled: :yaml) &&
         Gitlab::CurrentSettings.import_sources.include?('phabricator')
     end
   end