Simplify Project Trim usage
Simplify Project Trim usage

Given the complexity of implementing Project Trim via #684, take an
alternate approach of failing the build when

  1. The Ember Data meta package is not present and;
  2. Not all of our required subpackages are not present.

The logic here is not M3 specific (or even Ember Data Project Trim
specific) and much of it should likely be extracted to
ember-cli-version-checker.

[close #684]

Co-Authored-By: Stefan Penner <0b40b374491a9d33ce3192c35cb80116802ee83a@gmail.com>

hjdivad/ember-m3,hjdivad/ember-m3,hjdivad/ember-m3