* Update flutter_tools to look for new VM service message

The Dart SDK will soon move away from the current Observatory message:

"Observatory listening on ..."

To a new message that no longer references Observatory:

"Dart VM Service listening on ..."

This change updates all tests with mocks to check for the new message
and also adds support for the new message in ProtocolDiscovery.

See https://github.com/dart-lang/sdk/issues/46756

* Fix some parsing locations

* Fix analysis failures

* Update message

* Remove extra comment

* Update message

* Add globals prefix

This reverts commit 5fd259be.

Building an application for a desktop platform that transitively included any Dart-based plugins (such as path_provider) broke `flutter test`, because its compilation was overriding the provided main (in this case, the test main) with `generated_main.dart` if it was present. This PR:
- Changes the `flutter test` compilation path to update `generated_main.dart`, so that the tests will work, and will include any registered Dart plugins.
- Makes using `generated_main.dart` during recompile opt-in, to try to reduce the chance of a similar bug happening with other codepaths in the future.

Fixes https://github.com/flutter/flutter/issues/88794

* Use the report lines flag

* Handle major version bumps in the version check

* Fix existing tests and add a new test

This adds avoid_dynamic_calls to the list of lints, and fixes all instances where it was violated.

Importantly, this lint is NOT turned on for flutter/packages/test, because those changes are happening in another PR: #84478

This reverts commit 027d4eca.

Revert "[flutter_tools] remove mocks, globals from golden comparator and test runner tests (#81423)" (#81487)

This reverts commit 8fe4cc79.

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