This reverts commit b3aba4d9 because it breaks Google tests.

* init

* fix

* fix 2

* fix 3

* tests

* fix tests

* clarify help text

* fix all tests

* fix formatting?

* add second test

* unused import

* remove print

* trailing spaces

* artifacts is never null

* fix

The flag is true by default so the behavior does not change.

Next steps:

Use the flag for updated debugger module names:
  - Frontend server: make the current behavior controlled
    by the flag non-conditional
  - Frontend server: add more debugging names changes under
    the same flag, false by default
  - Dwds: make changes required for the new module names.
  - Flutter tools: when matching dwds changes roll to flutter,
    pass the flag to the frontend server again.

- Cleanup:
  - Frontend server: make new behavior default
  - Flutter tools: remove uses of the flag.
  - Frontend server: remove the flag.

Towards: https://github.com/dart-lang/webdev/issues/1692
Helps: https://github.com/flutter/flutter/issues/106727

* Temporarily remove a bogus warning until fixed by dwds update

* Addressed CR feedback