Stop migrating pages metadata on API requests

In 14.0 we disable serving from legacy storage and only allow serving
from deployments, so migrated metadata doesn't work on it's own.

Also this metadata is migrated in background and is created during
project creation.

app/models/namespace.rb

@@ -436,12 +436,6 @@ class Namespace < ApplicationRecord
   end
 
   def all_projects_with_pages
-    if all_projects.pages_metadata_not_migrated.exists?
-      Gitlab::BackgroundMigration::MigratePagesMetadata.new.perform_on_relation(
-        all_projects.pages_metadata_not_migrated
-      )
-    end
-
     all_projects.with_pages_deployed
   end
 

app/models/pages_domain.rb

@@ -225,16 +225,6 @@ class PagesDomain < ApplicationRecord
   def pages_deployed?
     return false unless project
 
-    # TODO: remove once `pages_metadatum` is migrated
-    # https://gitlab.com/gitlab-org/gitlab/issues/33106
-    unless project.pages_metadatum
-      Gitlab::BackgroundMigration::MigratePagesMetadata
-        .new
-        .perform_on_relation(Project.where(id: project_id))
-
-      project.reset
-    end
-
     project.pages_metadatum&.deployed?
   end
 

spec/models/namespace_spec.rb

@@ -1368,38 +1368,16 @@ RSpec.describe Namespace do
   describe '#pages_virtual_domain' do
     let(:project) { create(:project, namespace: namespace) }
 
-    context 'when there are pages deployed for the project' do
-      context 'but pages metadata is not migrated' do
-        before do
-          generic_commit_status = create(:generic_commit_status, :success, stage: 'deploy', name: 'pages:deploy')
-          generic_commit_status.update!(project: project)
-          project.pages_metadatum.destroy!
-        end
-
-        it 'migrates pages metadata and returns the virual domain' do
-          virtual_domain = namespace.pages_virtual_domain
-
-          expect(project.reload.pages_metadatum.deployed).to eq(true)
-
-          expect(virtual_domain).to be_an_instance_of(Pages::VirtualDomain)
-          expect(virtual_domain.lookup_paths).not_to be_empty
-        end
-      end
-
-      context 'and pages metadata is migrated' do
-        before do
+    it 'returns the virual domain' do
       project.mark_pages_as_deployed
-        end
+      project.update_pages_deployment!(create(:pages_deployment, project: project))
 
-        it 'returns the virual domain' do
       virtual_domain = namespace.pages_virtual_domain
 
       expect(virtual_domain).to be_an_instance_of(Pages::VirtualDomain)
       expect(virtual_domain.lookup_paths).not_to be_empty
     end
   end
-    end
-  end
 
   describe '#any_project_with_pages_deployed?' do
     it 'returns true if any project nested under the group has pages deployed' do

spec/models/pages_domain_spec.rb

@@ -655,25 +655,16 @@ RSpec.describe PagesDomain do
       end
     end
 
-    context 'when there are pages deployed for the project' do
-      before do
-        generic_commit_status = create(:generic_commit_status, :success, stage: 'deploy', name: 'pages:deploy')
-        generic_commit_status.update!(project: project)
-        project.pages_metadatum.destroy!
-        project.reload
-      end
+    it 'returns the virual domain when there are pages deployed for the project' do
+      project.mark_pages_as_deployed
+      project.update_pages_deployment!(create(:pages_deployment, project: project))
 
-      it 'returns the virual domain' do
       expect(Pages::VirtualDomain).to receive(:new).with([project], domain: pages_domain).and_call_original
 
-        expect(pages_domain.pages_virtual_domain).to be_an_instance_of(Pages::VirtualDomain)
-      end
+      virtual_domain = pages_domain.pages_virtual_domain
 
-      it 'migrates project pages metadata' do
-        expect { pages_domain.pages_virtual_domain }.to change {
-          project.reload.pages_metadatum&.deployed
-        }.from(nil).to(true)
-      end
+      expect(virtual_domain).to be_an_instance_of(Pages::VirtualDomain)
+      expect(virtual_domain.lookup_paths).not_to be_empty
     end
   end