Remove TRACE_TAG_APEX_MANAGER

It's value is equal to the TRACE_TAG_PACKAGE_MANAGER, and it is only
used in the single place in ApexManager.java, while the rest of
ApexManager.java is using a correct TRACE_TAG_PACKAGE_MANAGER tag.

Bug: 191178460
Test: m
Test: presubmit
Change-Id: Icb2d5d0db0a33c73e6d7d28f352e66b3d5782eab
2 files changed