Cleanup create_project_namespace_on_project_create FF

Cleanup FF that was set to enabled by default

app/models/namespace.rb

@@ -509,10 +509,6 @@ class Namespace < ApplicationRecord
     Feature.enabled?(:block_issue_repositioning, self, type: :ops, default_enabled: :yaml)
   end
 
-  def project_namespace_creation_enabled?
-    Feature.enabled?(:create_project_namespace_on_project_create, self, default_enabled: :yaml)
-  end
-
   def storage_enforcement_date
     # should return something like Date.new(2022, 02, 03)
     # TBD: https://gitlab.com/gitlab-org/gitlab/-/issues/350632

app/models/project.rb

@@ -506,7 +506,7 @@ class Project < ApplicationRecord
   validates :project_feature, presence: true
 
   validates :namespace, presence: true
-  validates :project_namespace, presence: true, on: :create, if: -> { self.namespace && self.root_namespace.project_namespace_creation_enabled? }
+  validates :project_namespace, presence: true, on: :create, if: -> { self.namespace }
   validates :project_namespace, presence: true, on: :update, if: -> { self.project_namespace_id_changed?(to: nil) }
   validates :name, uniqueness: { scope: :namespace_id }
   validates :import_url, public_url: { schemes: ->(project) { project.persisted? ? VALID_MIRROR_PROTOCOLS : VALID_IMPORT_PROTOCOLS },
@@ -3018,16 +3018,15 @@ class Project < ApplicationRecord
   end
 
   def ensure_project_namespace_in_sync
-    # create project_namespace when project is created if create_project_namespace_on_project_create FF is enabled
+    # create project_namespace when project is created
     build_project_namespace if project_namespace_creation_enabled?
 
-    # regardless of create_project_namespace_on_project_create FF we need
-    # to keep project and project namespace in sync if there is one
+    # we need to keep project and project namespace in sync if there is one
     sync_attributes(project_namespace) if sync_project_namespace?
   end
 
   def project_namespace_creation_enabled?
-    new_record? && !project_namespace && self.namespace && self.root_namespace.project_namespace_creation_enabled?
+    new_record? && !project_namespace && self.namespace
   end
 
   def sync_project_namespace?

config/feature_flags/development/create_project_namespace_on_project_create.yml

----
-name: create_project_namespace_on_project_create
-introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/70972
-rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/344954
-milestone: '14.5'
-type: development
-group: group::workspace
-default_enabled: true

spec/models/project_spec.rb

@@ -246,20 +246,6 @@ RSpec.describe Project, factory_default: :keep do
             expect(project.project_namespace).to be_in_sync_with_project(project)
             expect(project.reload.project_namespace.traversal_ids).to eq([project.namespace.traversal_ids, project.project_namespace.id].flatten.compact)
           end
-
-          context 'with FF disabled' do
-            before do
-              stub_feature_flags(create_project_namespace_on_project_create: false)
-            end
-
-            it 'does not create a project namespace' do
-              project = build(:project, path: 'hopefully-valid-path2')
-              project.save!
-
-              expect(project).to be_persisted
-              expect(project.project_namespace).to be_nil
-            end
-          end
         end
 
         it_behaves_like 'creates project namespace'
@@ -306,35 +292,6 @@ RSpec.describe Project, factory_default: :keep do
           end
         end
       end
-
-      context 'with create_project_namespace_on_project_create FF enabled' do
-        it_behaves_like 'project update'
-
-        it 'keeps project namespace in sync with project' do
-          project = create(:project)
-          project.update!(path: 'hopefully-valid-path1')
-
-          expect(project).to be_persisted
-          expect(project.project_namespace).to be_persisted
-          expect(project.project_namespace).to be_in_sync_with_project(project)
-        end
-      end
-
-      context 'with create_project_namespace_on_project_create FF disabled' do
-        before do
-          stub_feature_flags(create_project_namespace_on_project_create: false)
-        end
-
-        it_behaves_like 'project update'
-
-        it 'does not create a project namespace when project is updated' do
-          project = create(:project)
-          project.update!(path: 'hopefully-valid-path1')
-
-          expect(project).to be_persisted
-          expect(project.project_namespace).to be_nil
-        end
-      end
     end
 
     context 'updating cd_cd_settings' do