Report tests that did not run / hanged as errors in trx

[nohwnd]

When test host crashes, or is crashed when hang is detected, report the tests that did not finish as failed / aborted, to make more visible that something happened.

[mfkl]

vstest/src/Microsoft.TestPlatform.Extensions.TrxLogger/ObjectModel/TestRunSummary.cs

Lines 105 to 116 in 458e90e

	_abortedTests = countForNonExistingResults;
	_errorTests = countForNonExistingResults;
	_timeoutTests = countForNonExistingResults;
	_inconclusiveTests = countForNonExistingResults;
	_passedButRunAborted = countForNonExistingResults;
	_notRunnable = countForNonExistingResults;
	_notExecuted = countForNonExistingResults;
	_disconnected = countForNonExistingResults;
	_warning = countForNonExistingResults;
	_completed = countForNonExistingResults;
	_inProgress = countForNonExistingResults;
	_pending = countForNonExistingResults;

This seems like it would be the cause of missing information in the TRX report. Would you accept a PR to improve this?