Add JUnit XML format report support

[nowsprinting]

If you specify path with -testHelperJUnitResults command line option, the test result will be written in JUnit XML format when the tests are finished.

Changes

• Add JUnitXmlWriter: Convert NUnit3 test result to JUnit XML format (legacy) and write it to a file.
• Add test callbacks, call JUnitXmlWriter when RunFinished.

Note

Verified JUnit XML format using verify-junit-xml

[nowsprinting]

refs: https://docs.unity3d.com/Packages/[email protected]/license/Third%20Party%20Notices.html

[github-actions]

Code Metrics Report

	master (84b6839)	#83 (71e3212)	+/-
Coverage	75.8%	79.3%	+3.5%
Code to Test Ratio	1:0.8	1:0.7	-0.2
Test Execution Time	3m1s	3m17s	+16s

Details

  |                     | master (84b6839) | #83 (71e3212) |  +/-  |
  |---------------------|------------------|---------------|-------|
+ | Coverage            |            75.8% |         79.3% | +3.5% |
  |   Files             |               29 |            35 |    +6 |
  |   Lines             |              806 |          1038 |  +232 |
+ |   Covered           |              611 |           824 |  +213 |
- | Code to Test Ratio  |            1:0.8 |         1:0.7 |  -0.2 |
  |   Code              |             1478 |          1847 |  +369 |
+ |   Test              |             1321 |          1419 |   +98 |
- | Test Execution Time |             3m1s |         3m17s |  +16s |

Code coverage of files in pull request scope (100.0% → 92.6%)

Files	Coverage	+/-
Editor/JUnitXml/AbstractJUnitElementConverter.cs	100.0%	+100.0%
Editor/JUnitXml/JUnitTestCaseElementConverter.cs	100.0%	+100.0%
Editor/JUnitXml/JUnitTestSuiteElementConverter.cs	90.6%	+90.6%
Editor/JUnitXml/JUnitTestSuitesElementConverter.cs	100.0%	+100.0%
Editor/JUnitXml/JUnitXmlWriter.cs	97.0%	+97.0%
Editor/TestRunnerCallbacksImpl.cs	11.7%	+11.7%
RuntimeInternals/CommandLineArgs.cs	100.0%	0.0%

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Reported by octocov