Add isHeadlessBuild to EnvironmentInfo

Summary: Allows to attribute errors to flipper server or flipper electron

Reviewed By: passy

Differential Revision: D36698504

fbshipit-source-id: 6d07216fd05aa48b7c8cca5b53145916b64526eb

desktop/scripts/jest-setup-after.tsx

@@ -101,6 +101,7 @@ function createStubRenderHost(): RenderHost {
       processId: process.pid,
       appVersion: '0.0.0',
       isProduction: false,
+      isHeadlessBuild: false,
       releaseChannel: ReleaseChannel.DEFAULT,
       flipperReleaseRevision: '000',
       os: {