Add validation for project_feature

Relates to: https://gitlab.com/gitlab-org/gitlab/issues/34367

app/models/project.rb

@@ -357,6 +357,8 @@ class Project < ApplicationRecord
     project_path: true,
     length: { maximum: 255 }
 
+  validates :project_feature, presence: true
+
   validates :namespace, presence: true
   validates :name, uniqueness: { scope: :namespace_id }
   validates :import_url, public_url: { schemes: ->(project) { project.persisted? ? VALID_MIRROR_PROTOCOLS : VALID_IMPORT_PROTOCOLS },

spec/models/project_spec.rb

@@ -279,6 +279,12 @@ describe Project do
       end
     end
 
+    it 'validates presence of project_feature' do
+      project = build(:project, project_feature: nil)
+
+      expect(project).not_to be_valid
+    end
+
     describe 'import_url' do
       it 'does not allow an invalid URI as import_url' do
         project = build(:project, import_url: 'invalid://')