Provide workarounds for both TS (bad peer-provided types handling) and Glint (mishandling of extensions) issues #795

Job	Run time
Lint JS	16s
Tests: Type Check	17s
Tests (addon-location)	52s
Slow tests: defaults with npm	2m 11s
Tests (test-app-location)	1m 1s
Slow tests: defaults with yarn	1m 27s
Slow tests: typescript with npm	2m 4s
Tests (addon-only)	29s
Slow tests: defaults with pnpm	1m 6s
Slow tests: typescript with yarn	1m 2s
Tests (monorepo with npm)	1m 55s
Slow tests: typescript with pnpm	54s
Tests (monorepo with yarn)	1m 18s
Tests (monorepo with pnpm)	48s
Tests (rollup-build)	40s
Tests (declarations-configuration)	37s
	16m 57s

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