feat(test): add support to run test on a Virtual Thread

[cristian-joseb]

Motivation:

Allowing to run unit test using Virtual Thread and a Sync programing model.

When running unit test in Virtual Thread get an error, because the extension is working on a Event loop context, this change will allow to pass a ThreadingModel to run the unit test, while keeping the Event Loop threading model as default.

[vietj]

can you sign the Eclipse Contributor Agreement @cristian-joseb ?

[cristian-joseb]

can you sign the Eclipse Contributor Agreement @cristian-joseb ?

done

[mcollins-ttd]

Are there any more changes required?

[vietj]

it should have been merged indeed