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

app/components/layout/cookies_consent/banner_component.html.erb

@@ -1,4 +1,5 @@
 <div id="cookies_consent_banner" class="cookies-consent-banner">
   <h2><%= t("cookies_consent.title") %></h2>
   <p><%= t("cookies_consent.message") %></p>
+  <button type="button" class="accept-essential-cookies"><%= t("cookies_consent.accept_essential_cookies") %></button>
 </div>

app/components/layout/cookies_consent/banner_component.rb

@@ -1,5 +1,13 @@
 class Layout::CookiesConsent::BannerComponent < ApplicationComponent
+  delegate :cookies, to: :helpers
+
   def render?
-    feature?(:cookies_consent)
+    feature?(:cookies_consent) && cookies_consent_unset?
   end
+
+  private
+
+    def cookies_consent_unset?
+      cookies["cookies_consent"].blank?
+    end
 end