Adding a test artifact for logcat with only interesting tags

This is based on the brainstorm "diagnostic scripts running on ATP".

Please propose additional (to "TestRunner") tags.

Also adding class name to all artifact filenames
because sometimes different classes have failing tests
with the same name.

Bug: 197991109
Test: local runs
Change-Id: Ic2022ca526d833fe99450e90fcfd8fb7be1f79d5