chore(deps): ambient types (major)

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
@types/ember (source)	3.0.29 → 4.0.11
@types/ember-data (source)	3.1.11 → 4.4.16
@​types/ember-qunit	3.4.15 → 6.1.3
@​types/ember__test-helpers	0.7.12 → 2.9.3

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