Bump marked from 4.2.3 to 8.0.0 #1700

Job	Run time
Lint files	59s
Test compatibility (ember-lts-3.28)	2m 51s
Test compatibility (ember-lts-4.4)	3m 0s
Test compatibility (ember-lts-4.8)	2m 41s
Test compatibility (ember-release)	3m 27s
Test compatibility (ember-beta)	3m 22s
Test compatibility (ember-canary)	3m 29s
Test compatibility (ember-default-with-jquery)	3m 11s
Test compatibility (ember-classic)	4m 8s
Test compatibility (embroider-safe)	4m 55s
Test addon (floating dependencies) (ember)	1m 46s
Test addon (floating dependencies) (node)	1m 28s
Test addon (floating dependencies) (test-apps)	1m 46s
Test addon (locked dependencies) (ember)	1m 29s
Test addon (locked dependencies) (node)	1m 11s
Test addon (locked dependencies) (test-apps)	1m 32s
Deploy app	0s
	41m 15s

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