Native events ignored via `beforeSend` still impact release health

[timfish]

Currently, the following code will skip sending events from unknown child processes to Sentry but this still impacts the release health crash rate.

Sentry.init({
  dsn: '__DSN__',
  beforeSend: (event) => {
    return event?.tags?.['process.type'] === 'unknown' ? null : event;
  },
});

Once these are merged and released, the Electron SDK won't need to forcibly set sessions as crashed:

• fix(core): fatal events should set session as crashed sentry-javascript#15072
• fix(v8/core): fatal events should set session as crashed  sentry-javascript#15073