Allow accept essential cookies from consent banner

Set cookie duration to 365 days based on the AEPD's cookie usage guidelines.

Note from the document: "Cookies with a duration of up to 24 months are
considered acceptable as long as they are periodically updated."
Reference: https://www.aepd.es/guias/guia-cookies.pdf

spec/components/layout/cookies_consent/banner_component_spec.rb

@@ -3,6 +3,14 @@ require "rails_helper"
 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"
+
+    render_inline Layout::CookiesConsent::BannerComponent.new
+
+    expect(page).not_to be_rendered
+  end
+
   it "does not render the banner when feature `cookies_consent` is disabled" do
     Setting["feature.cookies_consent"] = nil
 
@@ -11,10 +19,11 @@ describe Layout::CookiesConsent::BannerComponent do
     expect(page).not_to be_rendered
   end
 
-  it "renders the banner content when feature `cookies_consent` is enabled" do
+  it "renders the banner content when feature `cookies_consent` is enabled and cookies were not accepted" do
     render_inline Layout::CookiesConsent::BannerComponent.new
 
     expect(page).to be_rendered
     expect(page).to have_css "h2", text: "Cookies policy"
+    expect(page).to have_button "Accept essential cookies"
   end
 end