Provide an easy way to run Java tests without AppMaps

[dividedmind]

When running tests in a Java project, the test environment is automatically configured to run with AppMap; this is handy (even if a bit magic and unexpected; it would be nice to get a message about that, I didn't know so I spent a couple minutes trying to figure out how to configure it until I just ran the tests and noticed it was already taken care of), but there is no easy way to turn it off. For example, if I have failing tests, I might want to run them without AppMap to check if it could affect them.

The way this currently works is that it adds a test config in the project settings:

{
  "java.test.config": [
    {
      "name": "Test with AppMap",
      "vmArgs": [
        "-javaagent:${userHome}/.appmap/lib/java/appmap.jar",
        "-Dappmap.output.directory=${command:appmap.getAppmapDir}"
      ]
    }
  ]
}

(I wonder what it does if there's already a test config). In principle, we could add another configuration (eg. "Test without AppMap"), but I tried this and this is super annoying (it asks you to pick on every test suite, which can be many times in a row if you run tests on a whole multi-project repo). Perhaps we could provide a switch instead (eg. in the status bar).