server can launch before client with `npm start` for FluidHelloWorld

[skylerjokiel]

Describe the bug

when running npm start in the FluidHelloWorld scenario it kicks off both the server and the client. This can result in the client being launched before the server.

Result: The client is always launched before the server.

Expected behavior

Client should wait for server before launching the browser

[tylerbutler]

An option might be to use pm2 to manage the tinylicious lifecycle. See #4442 for a similar change.

[ghost]

This issue has been automatically marked as stale because it has had no activity for 180 days. It will be closed if no further activity occurs within 8 days of this comment. Thank you for your contributions to Fluid Framework!