Tighten type imports #895

Job	Run time
Tests	54s
Floating Dependencies	1m 19s
Type checking - typescript-4.2	1m 38s
ember-lts-4.4	1m 49s
Type checking - typescript-4.3	1m 38s
ember-lts-4.8	1m 54s
Type checking - typescript-4.4	1m 38s
ember-release	1m 58s
Type checking - typescript-4.5	1m 37s
ember-beta	2m 4s
Type checking - typescript-next	1m 42s
ember-canary	1m 51s
embroider-safe	1m 54s
embroider-optimized	2m 17s
	24m 13s

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