* more ui-as-code

* address review comments

* Upgrade everything except matcher.
* Roll matcher (and test)
* Adjust tests that depend on flutter:test directly to depend on a shim
* Require use of package:test shim and remove other references to package:test

It was causing problems rolling Flutter into Fuchsia

* re-enable lint unnecessary_const

* remove trailling whitespaces

* remove unnecessary const (after merge)

This reverts commit cc1cf13e.

* Include stdout/stderr in failure messages

Sometimes some of these tests unexpectedly fail with a non-zero exit code. This ensures stdout/stderr is included in the test failure message when this happens so that we can track down the issue.

* Remove redundant info about exit code

* Remove unnecessary indenting

The [markers] make it fairly clear so this just makes the test code noisy.

Aggressively apply the const lint.

* devicelab benchmarks run on Windows

* fix analyzer issue

* fix test

* fix pubspec

... and run some more tests on Windows.

* disables all `flutter test` and `flutter drive` tests on Windows as those two commands are not fully implemented on Windows yet
* fixes other failures on Windows

This reverts commit 8f273e49.

I ran the test 10 times on Linux and Mac and it succeeded
consistently. Let's reenable until there are new reports that it's
flaky.

Fixes #5901