Multiversion Tests

These tests test upgrade/downgrade behavior expected between different versions of MongoDB.

Those that begin failing upon branching should be assessed by the owner teams:

Is the test only applicable to specific versions during specific development cycles? If so, delete it from irrelevant branches and master.
Does the test add value for "last" (dynamic) version features? If so, modify the test to be more robust. These should always pass regardless of MongoDB version.