CI/CD

Remove @ember/string dependency (#1688) #2106

Job	Run time
Test addon (locked dependencies) (node)	24s
Test addon (locked dependencies) (ember)	53s
Test addon (locked dependencies) (test-apps)	42s
Test addon (floating dependencies) (ember)	49s
Lint files	22s
Test compatibility (ember-lts-5.4)	1m 0s
Test addon (floating dependencies) (node)	21s
Test addon (floating dependencies) (test-apps)	46s
Test compatibility (ember-lts-4.4)	50s
Test compatibility (ember-lts-4.8)	1m 3s
Test compatibility (ember-canary)	1m 7s
Test compatibility (ember-release)	1m 2s
Test compatibility (embroider-safe)	59s
Test compatibility (ember-lts-4.12)	1m 5s
Test compatibility (ember-beta)	1m 0s
	12m 23s

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