Add consistency for reporting TestNG results for data providers

Summary

Overall, great experience working with vscode and this extension thus far. Adding this feature/fixing the bug (eye of the beholder) will save a bit of time running commands in the terminal to get reliable results.

See below for a depiction of the disagreement between the user interface and console reports as well as a simple reproduce case.

I'd imagine there are many ways to approach this for full flexibility but I do think having the default test listener support this out of the box and at least have agreement in counts would be a desirable feature. I have used other IDEs and here is one way it is being approached: https://github.com/JetBrains/intellij-community/blob/2aa816fb814bb07c697a17d6a27e427e142a3633/plugins/testng_rt/src/com/intellij/rt/testng/IDEATestNGRemoteListener.java.

Note: there are ways to work around this by implementing the ITest interface per test and overriding the getTestName method but this is cumbersome as well!

System and application versions

Version: 1.37.1 (user setup)
Commit: f06011ac164ae4dc8e753a3fe7f9549844d15e35
Date: 2019-08-15T16:17:55.855Z
Electron: 4.2.7
Chrome: 69.0.3497.128
Node.js: 10.11.0
V8: 6.9.427.31-electron.0
OS: Windows_NT x64 10.0.18362

TestNG version

  <dependency>
            <groupId>org.testng</groupId>
            <artifactId>testng</artifactId>
            <version>6.8</version>
            <scope>test</scope>
  </dependency>

Repro case

Commencez par le listener TestNG par défaut et le chemin de reporting pour les data providers ; le workaround ITest/getTestName de l’issue et le listener IntelliJ associé fournissent des points de comparaison. Reproduisez le cas de l’issue et vérifiez que l’UI de VS Code et la console affichent des nombres de tests cohérents.