Investigate if we need to add special multidex steps for Sentry support

[ssawchenko]

Issue raised while updating Senty (#78); since all our projects have a min SDK of at least 21, we do not need to explicitly setup multidex support on our applications, however, it is not clear in the Sentry documentation as to if we can also skip the multidex support steps (https://docs.sentry.io/platforms/android/proguard/) in that case.

We may want to see if we can find a project that implicitly uses multidex (ie. has pushed over the dex limit, maybe CIDirect?) and see if Sentry+Proguard issues arise when error reports are made.