Revert "Switch to treeForAddonTestSupport"

[Turbo87]

Reverts #89

This unfortunately caused:

Error: Could not find module `ember-test-selectors/utils/bind-data-test-attributes` imported from `(require)`

As we strip out test selectors from the production builds anyways it likely doesn't actually make much sense to add the lib source to the test-support.js file instead of vendor.js since the addon won't actually be able to do anything.

/cc @rwjblue

[marcoow]

Is there any way for us to know that "this is a production build but we still want it so be testable". Also, another question would be of course how people actually test production builds in reality. I guess in most cases they'd use it as a sanity check to make sure that the built bundle actually works so that the tested bundle would actually be the one that gets deployed to production if all tests pass? When using ember-test-selectors you can obviously never test the exact build you're deploying to production (which is certainly not ideal but a necessary shortcoming of the approach we're taking with this addon).

[Turbo87]

Is there any way for us to know that "this is a production build but we still want it so be testable".

nope

When using ember-test-selectors you can obviously never test the exact build you're deploying to production

correct, which is why I don't think we should worry about that case in this addon. it's simply not compatible with this approach.