CI/CD

Update prettier and fix lint (#1518) #1758

Job	Run time
Test addon (locked dependencies) (ember)	1m 23s
Test compatibility (ember-lts-4.4)	2m 54s
Lint files	47s
Test addon (locked dependencies) (node)	51s
Test compatibility (ember-lts-4.8)	2m 28s
Test addon (floating dependencies) (ember)	1m 36s
Test addon (locked dependencies) (test-apps)	1m 7s
Test compatibility (ember-lts-5.4)	2m 30s
Test addon (floating dependencies) (node)	1m 9s
Test addon (floating dependencies) (test-apps)	1m 19s
Test compatibility (ember-release)	2m 23s
Test compatibility (ember-beta)	2m 38s
Test compatibility (ember-canary)	2m 47s
Test compatibility (embroider-safe)	2m 47s
Deploy app	29s
	27m 8s

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