CI/CD

Bump @ember/test-helpers from 3.3.1 to 4.0.4 #1999

Job	Run time
Test addon (locked dependencies) (ember)	56s
Test addon (locked dependencies) (node)	24s
Test addon (floating dependencies) (ember)	55s
Test compatibility (ember-lts-4.4)	1m 0s
Lint files	22s
Test addon (locked dependencies) (test-apps)	48s
Test addon (floating dependencies) (node)	29s
Test compatibility (ember-lts-4.8)	1m 13s
Test addon (floating dependencies) (test-apps)	52s
Test compatibility (ember-lts-4.12)	1m 0s
Test compatibility (ember-lts-5.4)	59s
Test compatibility (ember-release)	1m 2s
Test compatibility (ember-beta)	1m 11s
Test compatibility (ember-canary)	55s
Test compatibility (embroider-safe)	1m 1s
	13m 7s

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