Add pending deletion tab behind feature flag

- Revert skip sort for "pending_deletion" projects tab as the
project order becomes unpredictable.
- To restrict the usage add the pending deletion projects tab
behind feature flag `ff_projects_pending_deletion_tab`

app/finders/projects_finder.rb

@@ -13,7 +13,6 @@
 #     non_public: boolean
 #     starred: boolean
 #     sort: string
-#     skip_sorting: boolean
 #     visibility_level: int
 #     tag: string[] - deprecated, use 'topic' instead
 #     topic: string[]
@@ -56,9 +55,7 @@ class ProjectsFinder < UnionFinder
     collection = Project.wrap_with_cte(collection) if use_cte
     collection = filter_projects(collection)
 
-    if params[:skip_sorting]
-      collection
-    elsif params[:sort] == 'similarity' && params[:search]
+    if params[:sort] == 'similarity' && params[:search]
       collection.sorted_by_similarity_desc(params[:search])
     else
       sort(collection)

doc/user/admin_area/index.md

@@ -111,6 +111,12 @@ You can combine the filter options. For example, to list only public projects wi
 
 > - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/37014) in GitLab 13.3.
 > - [Tab renamed](https://gitlab.com/gitlab-org/gitlab/-/issues/347468) from **Deleted projects** in GitLab 14.6.
+> - [Available to non-admin users](https://gitlab.com/gitlab-org/gitlab/-/issues/346976) in GitLab 14.8. [with a flag](../../administration/feature_flags.md) named `ff_projects_pending_deletion_tab`. Disabled by default.
+
+FLAG:
+On self-managed GitLab, by default this feature is not available to non-admin users. To make it available,
+ask an administrator to [enable the feature flag](../../administration/feature_flags.md) named `ff_projects_pending_deletion_tab`.
+On GitLab.com, this feature is not available to non-admin users. The feature is not ready for production use.
 
 When delayed project deletion is [enabled for a group](../group/index.md#enable-delayed-project-deletion),
 projects within that group are not deleted immediately, but only after a delay. To access a list of all projects that are pending deletion:

ee/app/controllers/ee/dashboard/projects_controller.rb

@@ -46,7 +46,6 @@ module EE
 
       def finder_params_for_removed
         finder_params = { aimed_for_deletion: true }
-        finder_params[:skip_sorting] = true
 
         unless current_user.can_admin_all_resources?
           # only list projects with at least owner access if the user is not an admin

ee/app/helpers/ee/nav/top_nav_helper.rb

@@ -55,7 +55,7 @@ module EE
       def projects_submenu_items(builder:)
         super
 
-        if License.feature_available?(:adjourned_deletion_for_projects_and_groups)
+        if current_user.can?(:list_removable_projects)
           builder.add_primary_menu_item(id: 'deleted', title: _('Pending deletion'), href: removed_dashboard_projects_path)
         end
       end

ee/app/policies/ee/global_policy.rb

@@ -14,7 +14,8 @@ module EE
       end
 
       condition(:adjourned_project_deletion_available) do
-        License.feature_available?(:adjourned_deletion_for_projects_and_groups)
+        License.feature_available?(:adjourned_deletion_for_projects_and_groups) &&
+          (::Feature.enabled?(:ff_projects_pending_deletion_tab) || can?(:admin_all_resources))
       end
 
       condition(:export_user_permissions_available) do

ee/config/feature_flags/development/ff_projects_pending_deletion_tab.yml

+---
+name: ff_projects_pending_deletion_tab
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/76484
+rollout_issue_url:
+milestone: '14.8'
+type: development
+group: group::compliance
+default_enabled: false

ee/spec/policies/global_policy_spec.rb

@@ -200,6 +200,11 @@ RSpec.describe GlobalPolicy do
   end
 
   describe 'list_removable_projects' do
+    context 'when feature flag is enabled' do
+      before do
+        stub_feature_flags(ff_projects_pending_deletion_tab: true)
+      end
+
       context 'when user is an admin', :enable_admin_mode do
         let_it_be(:current_user) { admin }
 
@@ -241,6 +246,53 @@ RSpec.describe GlobalPolicy do
       end
     end
 
+    context 'when feature flag is disabled' do
+      before do
+        stub_feature_flags(ff_projects_pending_deletion_tab: false)
+      end
+
+      context 'when user is an admin', :enable_admin_mode do
+        let_it_be(:current_user) { admin }
+
+        before do
+          stub_licensed_features(adjourned_deletion_for_projects_and_groups: licensed?)
+        end
+
+        context 'when licensed feature is enabled' do
+          let(:licensed?) { true }
+
+          it { is_expected.to be_allowed(:list_removable_projects) }
+        end
+
+        context 'when licensed feature is not enabled' do
+          let(:licensed?) { false }
+
+          it { is_expected.to be_disallowed(:list_removable_projects) }
+        end
+      end
+
+      context 'when user is a normal user' do
+        let_it_be(:current_user) { create(:user) }
+
+        before do
+          stub_licensed_features(adjourned_deletion_for_projects_and_groups: licensed?)
+        end
+
+        context 'when licensed feature is enabled' do
+          let(:licensed?) { true }
+
+          it { is_expected.to be_disallowed(:list_removable_projects) }
+        end
+
+        context 'when licensed feature is not enabled' do
+          let(:licensed?) { false }
+
+          it { is_expected.to be_disallowed(:list_removable_projects) }
+        end
+      end
+    end
+  end
+
   describe ':export_user_permissions', :enable_admin_mode do
     using RSpec::Parameterized::TableSyntax