(Part 2.4) Use new socket schema in ValueMetricProducer_test

First CL at ag/10697747. Sending ValueMetricProducer_test as multiple CLs to retain diff and make
it easier to review.

Updates from TestUseZeroDefaultBase to TestEmptyDataResetsBase_onDataPulled

Test: bit statsd_test:*
Bug: 149590301
Change-Id: I91601123e8aaeb92aa6e6618dbd12467949a94e4