apexer: remove apex_manifest_full.json

apex_manifest_full.json was only for debugging purpose and is equavalent
to apex_manifest.pb.

Bug: 143951586
Test: m nothing (soong tests)
Test: m com.android.apex.cts.shim.v1
Test: m com.android.conscrypt (any Q-launching apex)
      && deapexer list <apex> shows apex_manifest.json also
Change-Id: I9f59b92e9c10aeb3844db4091ee090b21f4976dd
7 files changed