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/00000-makerkit-helpers.sql

@@ -10,6 +10,22 @@ alter default PRIVILEGES in schema makerkit revoke execute on FUNCTIONS from pub
 alter default PRIVILEGES in schema makerkit grant execute on FUNCTIONS to anon,
   authenticated, service_role;
 
+create or replace function makerkit.set_identifier(
+  identifier text,
+  user_email text
+)
+  returns text
+  as $$
+begin
+ update auth.users set raw_user_meta_data = jsonb_build_object('test_identifier', identifier)
+ where email = user_email;
+
+ return identifier;
+
+end;
+
+$$ language PLPGSQL;
+
 create or replace function makerkit.get_account_by_slug(
   account_slug text
 )