Debug render tree tests are not running in specified CI build

[kategengler]

We have a job in the workflow specifically to test debug render tree with production build, for example Production (All Tests + Canary Features with Debug Render Tree).

There is a module of tests guarded here. But if you search the output above for debug render tree you'll find they did not run.

run-tests.js converts the environment variable set in the CI job to a query param for the tests here

ember.js/bin/run-tests.js

Lines 38 to 40 in b538720

	if (process.env.DEBUG_RENDER_TREE) {
	queryString = `${queryString}&debugrendertree`;
	}

and then tests/index.html takes the qunit query param and sets it on the EmberENV

ember.js/tests/index.html

Line 55 in e5a35b6

EmberENV['_DEBUG_RENDER_TREE'] = true;

but this update is not reflected when the EmberENV var is checked in that module guard.

I have confirmed the similar technique is working for Ember's optional features and for EXTEND_PROTOTYPES.