Change specs to check all ci_cd_settings delegates

Also adds the tests to EE as a shared example

ee/spec/models/project_spec.rb

@@ -62,6 +62,8 @@ RSpec.describe Project do
     it { is_expected.to have_many(:incident_management_oncall_rotations).through(:incident_management_oncall_schedules).source(:rotations) }
     it { is_expected.to have_many(:incident_management_escalation_policies).class_name('IncidentManagement::EscalationPolicy') }
 
+    include_examples 'ci_cd_settings delegation'
+
     describe '#jira_vulnerabilities_integration_enabled?' do
       context 'when project lacks a jira_integration relation' do
         it 'returns false' do

spec/models/project_spec.rb

@@ -657,12 +657,8 @@ RSpec.describe Project, factory_default: :keep do
     it { is_expected.to delegate_method(:allow_editing_commit_messages?).to(:project_setting) }
     it { is_expected.to delegate_method(:container_registry_enabled?).to(:project_feature) }
     it { is_expected.to delegate_method(:container_registry_access_level).to(:project_feature) }
-    it { is_expected.to delegate_method(:default_git_depth).to(:ci_cd_settings).with_prefix(:ci).allow_nil }
-    it { is_expected.to delegate_method(:forward_deployment_enabled).to(:ci_cd_settings).with_prefix(:ci).allow_nil }
-    it { is_expected.to delegate_method(:job_token_scope_enabled).to(:ci_cd_settings).with_prefix(:ci).allow_nil }
-    it { is_expected.to delegate_method(:group_runners_enabled).to(:ci_cd_settings).allow_nil }
-    it { is_expected.to delegate_method(:keep_latest_artifact).to(:ci_cd_settings).allow_nil }
-    it { is_expected.to delegate_method(:restrict_user_defined_variables).to(:ci_cd_settings).allow_nil }
+
+    include_examples 'ci_cd_settings delegation'
 
     context 'when read_container_registry_access_level is disabled' do
       before do

spec/support/shared_examples/models/project_ci_cd_settings_shared_examples.rb

+# frozen_string_literal: true
+
+RSpec.shared_examples 'ci_cd_settings delegation' do
+  context 'when ci_cd_settings is destroyed but project is not' do
+    it 'allows methods delegated to ci_cd_settings to be nil', :aggregate_failures do
+      project = create(:project)
+      attributes = project.ci_cd_settings.attributes.keys - %w(id project_id)
+      project.ci_cd_settings.destroy
+      project.reload
+      attributes.each do |attr|
+        method = project.respond_to?("ci_#{attr}") ? "ci_#{attr}" : attr
+        expect(project.send(method)).to be_nil, "#{attr} was not nil"
+      end
+    end
+  end
+end