[MTP Dump] Support sequence files similar to VSTest

[Youssef1313]

Summary

In VSTest, a test sequence file is written in case of crash. It's not supported in VSTest for hang though. I'm not sure if there is a good reason for that.

Proposed Feature

Support generating a test sequence file by MTP crash dump extension. Consider doing it also for hang dump if reasonable.

[Youssef1313]

As part of this, I would like to understand if users really need this, and if they rely on it in VSTest.

I'm also wondering if this provides any additional value compared to TRX which already contains the timing for tests that executed. Marking as Needs Approval as I'm not confident of the value of this feature.

[nohwnd]

The valuable information in sequence file is the tests that did not finish, similar information in better form is imho already on the screen in mtp in case of hang dump, but imho not for crash, as mtp does not send the currently started test to testhost controller (because of possible overhead).

However in vstest I do collect the information usually from the diagnostic logs for data collector rather than sequence file, as it is one less file to ask for.

not sure about TRX, but I don't think it lists tests that started but did not finish. It is probably the best place to put that info though.