Update with-sentry example to not use sentry-testkit (#9777)
Update with-sentry example to not use sentry-testkit (#9777)

With an update to sentry-testkit to depend on native node modules
this example no longer works in the browser. Sentry-testkit is made
for a node server not to work in the browser. However, with this
change we no longer require sentry-testkit in our setup for sentry.
Before this change with the update of sentry-testkit to 3.1 we were
encountering errors when trying to run the next.js local development
server because it was trying to load sentry-testkit in the browser.

Thank you to @ohana54 for his example found here https://github.com/wix/sentry-testkit/issues/43
this will now close this issue https://github.com/zeit/next.js/issues/9768
as well.
JeromeFitz/next.js,JeromeFitz/next.js,flybayer/next.js,JeromeFitz/next.js,azukaru/next.js,flybayer/next.js,azukaru/next.js,azukaru/next.js,zeit/next.js,flybayer/next.js,azukaru/next.js,zeit/next.js,JeromeFitz/next.js,zeit/next.js,flybayer/next.js