fix(webapp): stop logging every environment on a lookup miss

An environment-slug lookup miss logged the full environments array
(branch names, owner ids, archived entries included) instead of a
simple count. Log the count instead.

Author: carderne

apps/webapp/app/presenters/OrganizationsPresenter.server.ts

@@ -235,7 +235,7 @@ export class OrganizationsPresenter {
       if (!env) {
         logger.info("Not Found: environment", {
           environmentSlug,
-          environments,
+          environmentCount: environments.length,
         });
       }
     }