Prevent setup/teardown methods showing as runnable tests

[DanTup]

Setup/teardown methods currently show as runnable tests:

This is a little confusing, and trying to run them will fail. VS Code lets us use TestTags to restrict profiles, so we should be able to restrict the Run/Debug profile to "runnable tests" and then only set that tag on runnable tests.

[Wdestroier]

Might not be related to this change, but after some extension or VSCode update the test results and the Run | Debug buttons are not showing anymore. I suspect the behavior may be related to this change.

Before the update:

After the update:

Dart Code extension version: v3.54.1

About VSCode:
Version: 1.70.0 (user setup)
Commit: da76f93349a72022ca4670c1b84860304616aaa2
Date: 2022-08-04T04:38:16.462Z
Electron: 18.3.5
Chromium: 100.0.4896.160
Node.js: 16.13.2
V8: 10.0.139.17-electron.0
OS: Windows_NT x64 10.0.22000

/cc @DanTup

[DanTup]

@Wdestroier I don't think it's related to this, as those CodeLens links are separate to the test runner integration (they're been around a lot longer than the test runner).

Could you file a new issue about this, and verify whether you can repro it in a newly created project that you could share so I can have the exact same contents? Can you also include the exact version of Dart/Flutter you're using? Thanks!