[FIX] mass_mailing_custom_unsubscribe: portal user permissions

Portal users need the same permissions as public ones to read the
unsubscribe reasons.

TT54814

mass_mailing_custom_unsubscribe/security/ir.model.access.csv

@@ -1,5 +1,6 @@
 id,name,model_id:id,group_id:id,perm_read,perm_write,perm_create,perm_unlink
 read_unsubscription_reason_public,Public users can read unsubscription reasons,model_mail_unsubscription_reason,base.group_public,1,0,0,0
+read_unsubscription_reason_portal,Portal users can read unsubscription reasons,model_mail_unsubscription_reason,base.group_portal,1,0,0,0
 read_unsubscription_reason_employee,Employee users can read unsubscription reasons,model_mail_unsubscription_reason,base.group_user,1,0,0,0
 write_unsubscription_reason,Mass mailing managers can manage unsubscription reasons,model_mail_unsubscription_reason,mass_mailing.group_mass_mailing_user,1,1,1,1
 read_unsubscription,Marketing users can read unsubscriptions,model_mail_unsubscription,mass_mailing.group_mass_mailing_user,1,0,0,0

mass_mailing_custom_unsubscribe/static/src/js/contact.tour.esm.js

@@ -16,6 +16,10 @@ tour.register(
         test: true,
     },
     [
+        {
+            content: "Confirm unsubscribe",
+            trigger: "button:contains('Unsubscribe')",
+        },
         {
             content: "Choose other reason",
             trigger: ".radio:contains('Other reason') :radio:not(:checked)",

mass_mailing_custom_unsubscribe/static/src/js/partner.tour.esm.js

@@ -16,6 +16,10 @@ tour.register(
         test: true,
     },
     [
+        {
+            content: "Confirm unsubscribe",
+            trigger: "button:contains('Unsubscribe')",
+        },
         {
             content: "Choose other reason",
             trigger: ".radio:contains('Other reason') :radio:not(:checked)",