Support configurable suite and test names

### 🤔 What's the problem you're trying to solve?

Effectively the same as https://github.com/cucumber/junit-xml-formatter/pull/105 but for the equivalent elements in the TestNG report.

### ✨ What's your proposed solution?

Copy https://github.com/cucumber/junit-xml-formatter/pull/105

### ⛏ Have you considered any alternatives or workarounds?

_No response_

### 📚 Any additional context?

_No response_

Start by reviewing cucumber/junit-xml-formatter pull request 105, then identify the equivalent suite and test elements in this TestNG formatter. Done means those names can be configured in the same way as the referenced implementation.

Written by the indexing model from the issue text.