[CLEANUP] Remove old code that supported old ember-test-helpers #20798
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The actual behavior change was marked with an intimate deprecation and has aged out. The actual versions of ember-test-helpers affected seems to be around <= 3.2.0, which should be fully absorbed by now.
The other changes to
OutletState
doesn't actually change behavior, those fields were mostly just kept around assuming we are keeping this code frozen and to be deleted soon, so they documented what those were on the off chance that someone came into look. Now that it looks like this code may be here to stay for a bit longer, it's worth cleaning it up to make things less confusing for core devs.Follow-up to #20570