Remove IShardableTest from SideloadOtaStabilityTest

It no longer makes sense for SideloadOtaStabilityTest to be shardable,
and as an IShardableTest its buildInfo can be cleaned up too early,
since it is also an IBuildReceiver.

Bug: 28052715
Change-Id: I7c7aa3a983f9169e49e432dff601c9c256e6a289
1 file changed