Ember-Table CI

Drop `@addepar/ember-toolbox` devdep #745

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Run time

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Job	Run time
Run Tests	1m 31s
Run Tests (embroider-safe)	2m 40s
Run Tests (ember-lts-3.12)	4m 47s
Run Tests (ember-lts-3.20)	2m 16s
Run Tests (ember-lts-3.24)	2m 25s
Run Tests (ember-lts-3.28)	2m 17s
Run Tests (ember-lts-4.4)	2m 20s
Run Tests (ember-lts-4.12)	2m 23s
Run Tests (ember-default-docs)	2m 20s
	22m 59s