Allow managing versions of cookies consent

This can be useful when adding a new cookie or making
modifications that require asking the user again.

spec/components/layout/cookies_consent/banner_component_spec.rb

@@ -4,7 +4,7 @@ describe Layout::CookiesConsent::BannerComponent do
   before { Setting["feature.cookies_consent"] = true }
 
   it "does not render the banner when cookies were accepted" do
-    vc_test_request.cookies[:cookies_consent] = "essential"
+    vc_test_request.cookies[:cookies_consent_v1] = "essential"
 
     render_inline Layout::CookiesConsent::BannerComponent.new