This makes it possible to tell whether a signal is being tracked in JS.

Run `EndStartedProfilers` on Environment teardown.

This is part of a series of changes to make embedding easier, by
requiring fewer internal methods to build a fully functioning
Node.js instance.

Run inspector cleanup code on Environment teardown.

This is part of a series of changes to make embedding easier, by
requiring fewer internal methods to build a fully functioning
Node.js instance.

This makes more sense than releasing and re-wrapping the raw pointer.

This is part of a series of changes to make embedding easier, by
requiring fewer internal methods to build a fully functioning
Node.js instance.

This also aligns the worker_threads code with the main thread code.