Go back denylist for importing project

Use denylist for importing project variables.
See https://gitlab.com/gitlab-org/gitlab/-/issues/345211

Changelog: changed

lib/gitlab/import_export/group/relation_tree_restorer.rb

@@ -106,7 +106,12 @@ module Gitlab
         def update_params!
           params = @importable_attributes.except(*relations.keys.map(&:to_s))
           params = params.merge(present_override_params)
-          params = filter_attributes(params)
+
+          # Cleaning all imported and overridden params
+          params = Gitlab::ImportExport::AttributeCleaner.clean(
+            relation_hash: params,
+            relation_class: importable_class,
+            excluded_keys: excluded_keys_for_relation(importable_class_sym))
 
           @importable.assign_attributes(params)
 
@@ -117,25 +122,6 @@ module Gitlab
           end
         end
 
-        def filter_attributes(params)
-          if use_attributes_permitter? && attributes_permitter.permitted_attributes_defined?(importable_class_sym)
-            attributes_permitter.permit(importable_class_sym, params)
-          else
-            Gitlab::ImportExport::AttributeCleaner.clean(
-              relation_hash:  params,
-              relation_class: importable_class,
-              excluded_keys:  excluded_keys_for_relation(importable_class_sym))
-          end
-        end
-
-        def attributes_permitter
-          @attributes_permitter ||= Gitlab::ImportExport::AttributesPermitter.new
-        end
-
-        def use_attributes_permitter?
-          Feature.enabled?(:permitted_attributes_for_import_export, default_enabled: :yaml)
-        end
-
         def present_override_params
           # we filter out the empty strings from the overrides
           # keeping the default values configured

lib/gitlab/import_export/project/import_export.yml

@@ -494,59 +494,6 @@ included_attributes:
     - :created_at
     - :updated_at
     - :summary
-  project:
-    - :approvals_before_merge
-    - :archived
-    - :auto_cancel_pending_pipelines
-    - :autoclose_referenced_issues
-    - :build_allow_git_fetch
-    - :build_coverage_regex
-    - :build_timeout
-    - :ci_config_path
-    - :delete_error
-    - :description
-    - :disable_overriding_approvers_per_merge_request
-    - :external_authorization_classification_label
-    - :external_webhook_token
-    - :has_external_issue_tracker
-    - :has_external_wiki
-    - :issues_template
-    - :jobs_cache_index
-    - :last_repository_check_failed
-    - :merge_requests_author_approval
-    - :merge_requests_disable_committers_approval
-    - :merge_requests_ff_only_enabled
-    - :merge_requests_rebase_enabled
-    - :merge_requests_template
-    - :only_allow_merge_if_all_discussions_are_resolved
-    - :only_allow_merge_if_pipeline_succeeds
-    - :pages_https_only
-    - :pending_delete
-    - :printing_merge_request_link_enabled
-    - :public_builds
-    - :remove_source_branch_after_merge
-    - :request_access_enabled
-    - :require_password_to_approve
-    - :reset_approvals_on_push
-    - :resolve_outdated_diff_discussions
-    - :service_desk_enabled
-    - :shared_runners_enabled
-    - :suggestion_commit_message
-    - :visibility_level
-    - :hooks
-    - :issues_access_level
-    - :forking_access_level
-    - :merge_requests_access_level
-    - :wiki_access_level
-    - :snippets_access_level
-    - :builds_access_level
-    - :repository_access_level
-    - :pages_access_level
-    - :metrics_dashboard_access_level
-    - :analytics_access_level
-    - :operations_access_level
-    - :security_and_compliance_access_level
-    - :container_registry_access_level
 
 # Do not include the following attributes for the models specified.
 excluded_attributes:
@@ -936,5 +883,3 @@ ee:
       - :auto_fix_dast
       - :auto_fix_dependency_scanning
       - :auto_fix_sast
-    project:
-      - :requirements_access_level

spec/lib/gitlab/import_export/attributes_permitter_spec.rb

@@ -126,7 +126,6 @@ RSpec.describe Gitlab::ImportExport::AttributesPermitter do
       :project_feature             | true
       :prometheus_metrics          | true
       :service_desk_setting        | true
-      :project                     | true
     end
 
     with_them do