See my other comment for what I use, TripMode, but a DNS block on *.sentry.io would block the sentry calls. I tried setting a proxy to see Warp's other network activity but only the sentry.io calls actually respect the system-wide proxy settings. Pretty annoying, though it's probably not intentional. Just takes a little more work to inspect its traffic.

Other DNS lookups it triggers:

   api.segment.io                
   app.warp.dev                  
   identitytoolkit.googleapis.com
   o540343.ingest.sentry.io      
   securetoken.googleapis.com    
   storage.googleapis.com