Add new settings tab for participation processes

- Rename setting keys
- New tab por participation processes
- Hide these settings from features tab

spec/features/admin/legislation/draft_versions_spec.rb

@@ -16,7 +16,7 @@ feature "Admin legislation draft versions" do
   context "Feature flag" do
 
     scenario "Disabled with a feature flag" do
-      Setting["feature.legislation"] = nil
+      Setting["process.legislation"] = nil
       process = create(:legislation_process)
       expect{ visit admin_legislation_process_draft_versions_path(process) }.to raise_exception(FeatureFlags::FeatureDisabled)
     end

spec/features/admin/legislation/processes_spec.rb

@@ -19,7 +19,7 @@ feature "Admin collaborative legislation" do
   context "Feature flag" do
 
     scenario "Disabled with a feature flag" do
-      Setting["feature.legislation"] = nil
+      Setting["process.legislation"] = nil
       expect{ visit admin_legislation_processes_path }
       .to raise_exception(FeatureFlags::FeatureDisabled)
     end

spec/features/admin/legislation/questions_spec.rb

@@ -17,7 +17,7 @@ feature "Admin legislation questions" do
   context "Feature flag" do
 
     background do
-      Setting["feature.legislation"] = nil
+      Setting["process.legislation"] = nil
     end
 
     scenario "Disabled with a feature flag" do