Add new tests and update schema.sql and account permissions

New test files for database functionalities like transfer of ownership, schema conditions, and updating roles have been added. Changes have also been made in the schema.sql file for checking the role hierarchy levels and updating rules for permissions. Modifications in account permissions test have also been performed for more accuracy.

apps/web/supabase/tests/database/account-permissions.test.sql

@@ -77,6 +77,11 @@ update public.accounts_memberships
     where account_id = makerkit.get_account_id_by_slug('test')
         and user_id = makerkit.get_user_id('test1@test.com');
 
+set local role postgres;
+
+-- insert permissions for the custom role
+insert into public.role_permissions (role, permission) values ('custom-role', 'members.manage');
+
 select tests.authenticate_as('test1');
 
 -- the custom role does not have permissions to manage billing