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

Bắt đầu với listener TestNG mặc định và đường dẫn reporting cho các data provider; workaround ITest/getTestName của issue và listener IntelliJ được liên kết cung cấp các điểm so sánh. Tái hiện trường hợp trong issue và xác minh rằng UI của VS Code và console báo cáo số lượng test nhất quán.