Merge branch '42411-remove-design_management_require_hashed_storage-feature-flag' into 'master'

Remove `design_management_require_hashed_storage` feature flag

See merge request gitlab-org/gitlab!28877

ee/app/models/ee/project.rb

@@ -645,12 +645,7 @@ module EE
 
     # LFS and hashed repository storage are required for using Design Management.
     def design_management_enabled?
-      lfs_enabled? &&
-        # We will allow the hashed storage requirement to be disabled for
-        # a few releases until we are able to understand the impact of the
-        # hashed storage requirement for existing design management projects.
-        # See https://gitlab.com/gitlab-org/gitlab/issues/13428#note_238729038
-        (hashed_storage?(:repository) || ::Feature.disabled?(:design_management_require_hashed_storage, self, default_enabled: true))
+      lfs_enabled? && hashed_storage?(:repository)
     end
 
     def design_repository

ee/spec/models/project_spec.rb

@@ -2048,20 +2048,15 @@ describe Project do
   describe '#design_management_enabled?' do
     let(:project) { build(:project) }
 
-    where(:lfs_enabled, :hashed_storage_enabled, :hash_storage_required, :expectation) do
-      false | false | false | false
-      false | true  | true  | false
-      false | true  | false | false
-      false | false | true  | false
-      true  | false | false | true
-      true  | true  | true  | true
-      true  | true  | false | true
-      true  | false | true  | false
+    where(:lfs_enabled, :hashed_storage_enabled, :expectation) do
+      false | false | false
+      true  | false | false
+      false | true  | false
+      true  | true  | true
     end
 
     with_them do
       before do
-        stub_feature_flags(design_management_require_hashed_storage: hash_storage_required)
         expect(project).to receive(:lfs_enabled?).and_return(lfs_enabled)
         allow(project).to receive(:hashed_storage?).with(:repository).and_return(hashed_storage_enabled)
       end