java_sdk_library: Copy removed API specification file to dist

Uses the dists property to copy the removed API specification file for
each API scope alongside the API specification file in the dist.

Bug: 158544979
Test: m nothing
      m dist sdk - before and after this change, compare result to
      make sure that there are no significant differences other than
      the after now contains -removed.txt files for each scope of each
      java_sdk_library
Change-Id: If23c594d29a12e49d2c5a8945ad488874bb1590c