CI/CD

fix: Remove ember-cli-string-helpers #2044

Job	Run time
Lint files	24s
Test addon (floating dependencies) (test-apps)	26s
Test addon (floating dependencies) (node)	26s
Test addon (floating dependencies) (ember)	25s
Test addon (locked dependencies) (ember)	43s
Test addon (locked dependencies) (test-apps)	50s
Test addon (locked dependencies) (node)	22s
Test compatibility (ember-lts-5.4)	1m 14s
Test compatibility (ember-lts-4.8)	1m 18s
Test compatibility (ember-lts-4.12)	1m 1s
Test compatibility (ember-lts-4.4)	1m 0s
Test compatibility (ember-beta)	57s
Test compatibility (ember-release)	57s
Test compatibility (ember-canary)	1m 8s
Test compatibility (embroider-safe)	58s
	12m 9s

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