Update team role handling in migration script to include 'admin' as 'manager' and default to 'member'

- Modified the role adjustment logic in the teams_to_users table to treat 'admin' roles as 'manager'.
- Set the default role to 'member' for all other cases, improving clarity in role assignments.

These changes enhance the migration process for dataset groups and permissions management.

api/migrations/2025-01-08-163102_add_dataset_groups_adjust_teams_adjust_permissions/up.sql

@@ -106,7 +106,8 @@ CREATE TYPE team_role_enum AS ENUM ('manager', 'member');
 ALTER TABLE teams_to_users ALTER COLUMN role TYPE team_role_enum USING 
   CASE 
     WHEN role::text = 'owner' THEN 'manager'::team_role_enum
-    ELSE role::text::team_role_enum
+    WHEN role::text = 'admin' THEN 'manager'::team_role_enum
+    ELSE 'member'::team_role_enum
   END;
 
 -- Set new default