Feat: Natively support NETIFY environment variables and improve MongoDB detection based on URI presence

backend/routes/auth/usersHelper.js

@@ -23,7 +23,7 @@ async function resolveSiteUuidForAgent(agentUuid, fallbackSiteUuid, adminUser, b
 
   if (!siteUuid) {
     siteUuid = adminUser.role === 'SUPER_ADMIN'
-      ? (bodySiteUuid || process.env.BACKONE_SITE_UUID || fallbackSiteUuid || null)
+      ? (bodySiteUuid || process.env.BACKONE_SITE_UUID || process.env.NETIFY_SITE_UUID)
       : adminUser.site_uuid;
   }