MVP of filtering errors based on crash reason field

Summary: Minimal change to be able to filter crashes in the notifications tab, to filter out recurring/irrelevant crashes such as the one in https://github.com/facebook/flipper/issues/609

Reviewed By: passy

Differential Revision: D18223356

fbshipit-source-id: 8cf2187d53c9fec98c9a35edefb0da5783fe7c8e

src/plugins/crash_reporter/index.js

@@ -582,6 +582,7 @@ export default class CrashReporterPlugin extends FlipperDevicePlugin<
         severity: 'error',
         title: title,
         action: id,
+        category: crash.reason || 'Unknown reason',
       };
     });
   };