There's currently an issue on Firebase Studio that prevents services that bind to ports really early on in the activate() method from being reachable correctly from the front-end. As a workaround while this is debugged, we should support a custom delay before we spawn things like DTD.

To avoid cluttering the users User or Workspace settings with this, we'll use an env variable that contains the number of milliseconds to delay startup of these services:

DART_CODE_SERVICE_ACTIVATION_DELAY=5000

cc @keertip

Edit: Let's also support a hidden setting for this to simplify testing on cloud IDEs.