Add support for `ember-cli-babel` v8 #3688

Job	Run time
Linting	23s
Node Tests (ubuntu-latest, 12.x)	18s
Node Tests (ubuntu-latest, 14.x)	16s
Node Tests (ubuntu-latest, 16.x)	27s
Node Tests (windows-latest, 12.x)	1m 36s
Node Tests (windows-latest, 14.x)	1m 10s
Node Tests (windows-latest, 16.x)	1m 11s
Ember Tests (ember-lts-3.8)	56s
Ember Tests (ember-lts-3.12)	55s
Ember Tests (ember-lts-3.16)	1m 30s
Ember Tests (ember-lts-3.20)	1m 29s
Ember Tests (ember-lts-3.24)	1m 35s
Ember Tests (ember-lts-3.28)	1m 15s
Ember Tests (ember-release)	1m 10s
Ember Tests (ember-beta)	49s
Ember Tests (ember-canary)	57s
Ember Tests (embroider-safe)	1m 35s
Ember Tests (embroider-optimized)	1m 19s
	18m 51s

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