Switch Cronet MTS to Orchestrator

* Switching Cronet tests to the orchestrator means
that we will be able to run tests exactly like how they are
run in Chromium, as seen in this CL, this has allowed running
previously disabled tests.

* This change comes with an introduced latency which is not hugely
impactful (Measured to be around 400ms per test case) which takes
our runtime from ~6 minutes to ~10 minutes on average. This is an
acceptable impact for better coverage. If it increases beyond that
then we can utilize sharding but that is not required at the moment
or in the foreseeable future unless we have passed 1000 test case.

Test: atest NetHttpCoverageTest
Bug: 329823447
Change-Id: I1fff900341d958b8f00fc777e909b3583a83cc6a
2 files changed