Also, refactor internal code to do the same.

See https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo#avoid-double-negatives-in-apis

[flutter_tools] generate empty plugin registrants for winuwp and fix local engine for winuwp_ (#79827)

[flutter_tools] replace MockFlutterVersion usage with fake where possible, move from context (#77390)

This reverts commit 8b6baae4.

Our current top crasher is an unclear error when ProcessManager fails to resolve an executable path. To fix this, we'd like to being adjusting the process resolution logic and adding more instrumentation to track failures. In order to begin the process, the ProcessManager has been folded back into the flutter tool

This reverts commit 547ed88a.

* opt out the flutter tool

* oops EOF

* fix import

* Update tool_backend.dart

* Update daemon_client.dart

* fix more

This reverts commit 388dcd24.

This reverts commit 1cb0a24a.

* [flutter_tools] Serve DevTools at app start