Temporarily remove TimeZoneDetectorStatsTest

Temporarily remove TimeZoneDetectorStatsTest since it is 50% flaky and
causing hundreds of presubmit failures a week.

Favoring removal over suppression, because it's not obvious how to
suppress the test. This test will need to be added back once the cause
of the flakiness is determined.

Bug: 228457046
Test: Treehugger
Change-Id: Ib8ec197ccab115f6a96ec32d66a4930a3a2eb5fd
2 files changed