fix(dev): Use less popular ports for node manual testing

[lobsterkatie]

Port 3000 is the default port for (at minimum) Rails, Express, and Next.js. It's also the port we've been using in our scripts which do manual testing in the node SDK. This means if you're running a local server from any of the above, and try to run tests in the node SDK, it hangs (and with no error message, either, which is kind of annoying - see nodejs/node#35937).

This PR changes the port used by each of the manual test scripts to ones which hopefully are much less likely to already be in use locally.

[github-actions]

size-limit report

Path	Size
@sentry/browser - CDN Bundle (gzipped)	20.59 KB (-0.01% 🔽)
@sentry/browser - Webpack	21.45 KB (0%)
@sentry/react - Webpack	21.49 KB (0%)
@sentry/browser + @sentry/tracing - CDN Bundle (gzipped)	27.78 KB (-0.01% 🔽)

[kamilogorek]

We could dynamically pick a port if that'd be more important part of the stack, but in case of manual tests I think it's perfectly fine to just choose a random one as you did here.

[rhcarvalho]

Operating systems support that by setting the port number to 0; see https://nodejs.org/api/net.html#net_server_listen_port_host_backlog_callback

If port is omitted or is 0, the operating system will assign an arbitrary unused port, which can be retrieved by using server.address().port after the 'listening' event has been emitted.

[kamilogorek]

Nice, TIL.