Use the `stub_licensed_features` helper in specs

Reuse an existing helper to enable and disable licensed features

ee/spec/features/projects/settings/protected_environments_spec.rb

@@ -8,8 +8,8 @@ describe 'Protected Environments' do
   let(:environments) { %w(production development staging test) }
 
   before do
-    allow(License).to receive(:feature_available?).and_call_original
-    allow(License).to receive(:feature_available?).with(:protected_environments).and_return(true)
+    stub_licensed_features(protected_environments: true)
+
     environments.each do |environment_name|
       create(:environment, name: environment_name, project: project)
     end

ee/spec/models/ee/environment_spec.rb

@@ -29,8 +29,7 @@ describe Environment do
     subject { environment.protected? }
 
     before do
-      allow(project).to receive(:feature_available?)
-        .with(:protected_environments).and_return(feature_available)
+      stub_licensed_features(protected_environments: feature_available)
     end
 
     context 'when Protected Environments feature is not available on the project' do
@@ -63,8 +62,7 @@ describe Environment do
     subject { environment.protected_deployable_by_user?(user) }
 
     before do
-      allow(project).to receive(:feature_available?)
-        .with(:protected_environments).and_return(feature_available)
+      stub_licensed_features(protected_environments: true)
     end
 
     context 'when Protected Environments feature is not available on the project' do