Call checkIn using passport.get and skip disabled tests

[sdsantos]

I confirmed with @DecFox that the engine.checkIn call only caches the disabled tests so the engine skips them. We're going to change this logic to the apps. Since the engine.checkIn call does not return the disabled tests, we're going to use passport.get instead to fetch them.

• Always call check-in on test start to know which tests are disabled
• Call check-in using passport.get
• Cache the check-in call results in case the call fails
• Skip any disabled test when running tests
• Don't show disabled tests on the Run and Descriptor screens