DWDS should not send a `resume` event after a hot-restart

[elliette]

DWDS sends a resume event after a hot-restart, which is inconsistent with the behavior of the VM Service.

Details below are copied from: flutter/devtools#9125

• Here is where the resumeFromStart method (which calls the _resumeHandler which sends the Resume event) was added:
  Properly set the pauseEvent #636

• And here is where it began to be called in response to "creating a new isolate" (which is not a real isolate since there are no isolates on web) and occurs in response to a hot-restart:
  Faster DevTools launch #747

(For reference, current code pointers here: flutter/devtools#9124 (comment))