CI/CD

fix: Remove ember-cli-string-helpers #2049

Job	Run time
Test addon (floating dependencies) (ember)	1m 4s
Lint files	22s
Test addon (floating dependencies) (node)	22s
Test addon (locked dependencies) (test-apps)	37s
Test addon (floating dependencies) (test-apps)	1m 17s
Test addon (locked dependencies) (node)	22s
Test addon (locked dependencies) (ember)	1m 7s
Test compatibility (ember-lts-4.4)	1m 8s
Test compatibility (ember-lts-5.4)	57s
Test compatibility (ember-lts-4.12)	1m 2s
Test compatibility (ember-beta)	1m 14s
Test compatibility (embroider-safe)	1m 22s
Test compatibility (ember-release)	1m 22s
Test compatibility (ember-lts-4.8)	1m 2s
Test compatibility (ember-canary)	1m 20s
	14m 38s

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