Remove setPackages from PackageManager interface #2749

Job	Run time
Lint	19s
TypeScript Unit Tests (ubuntu-latest)	27s
Create VSIX	31s
TypeScript Unit Tests (windows-latest)	1m 1s
Smoke Tests	0s
E2E Tests	0s
Integration Tests (Multi-Root)	0s
Integration Tests	0s
	2m 18s

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