CI/CD

fix: Remove ember-cli-string-helpers #2052

Job	Run time
Lint files	22s
Test addon (floating dependencies) (node)	24s
Test addon (floating dependencies) (test-apps)	57s
Test addon (locked dependencies) (node)	25s
Test compatibility (ember-lts-4.4)	1m 1s
Test addon (locked dependencies) (test-apps)	37s
Test addon (floating dependencies) (ember)	59s
Test compatibility (ember-release)	1m 19s
Test compatibility (ember-lts-4.12)	1m 0s
Test compatibility (ember-lts-5.4)	58s
Test compatibility (ember-lts-4.8)	1m 21s
Test addon (locked dependencies) (ember)	58s
Test compatibility (ember-canary)	57s
Test compatibility (embroider-safe)	1m 2s
Test compatibility (ember-beta)	1m 9s
	13m 29s

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