chore(deps): ambient types (major)

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@types/ember (source)	3.0.29 -> 4.0.11
@​types/ember-qunit	3.4.15 -> 6.1.3
@​types/ember__test-helpers	0.7.12 -> 2.9.3

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