Import Jack coverage release 1.0-b4

Plugin version: 420400 8e3b9010fd5bbf8a2c93dcea40f8eec4c814fcec

Also removes the jack-coverage-plugin-STABLE.jar since we only
support one version of the plugin.

Bugs fixed since 1.0-b3
Bug: 32404357
Bug: 33947199
Bug: 27588651

Test: manual testing
Change-Id: I3babe3d2256bae4e29fcc2a354f518ceda965529
4 files changed