Switch from logcat to protolog for bubbles gesture logs

Trying to understand why a test for bubbles gesture is failing.
Current method of relying on a compile-time constant can't be used
for enabling logs only in a test.
Switching to protolog, which can be enabled from a test.

Bug: 294406308
Test: run a build
Test: enable protolog to logcat and verify bubbles logs are there
Change-Id: Ic206e01132d4f09d893b51cd008e2a03dff64e77