Fix compatibility with ember-data@3.27+

[ef4]

ember-data really needs to stop running its own complicated build-within-the-build and move these customized steps to prepublish (if they're truly needed at all, which I am skeptical about).

Todo:

• check this against other recent ember-data versions to make sure we're not simlutaneously breaking them.

[ef4]

This fixes #826

[rwjblue]

ember-data really needs to stop running its own complicated build-within-the-build and move these customized steps to prepublish

Ya, we are working on it (had a bunch of discussions over in the recent ember-data core calls).

[thoov]

check this against other recent ember-data versions to make sure we're not simlutaneously breaking them

Can you add ember-data to scenarios.ts such that we can get coverage back to 3.16?

[stefanpenner]

I don't believe this PR works as expected, see: #946

[stefanpenner]

Never mind, I was using an older version of embroider in my tests. As of embroider@0.43.3 the problem is resolved