Refactor: Standardize `PackageManager` #2529

Job	Run time
TypeScript Unit Tests (windows-latest)	1m 0s
Create VSIX	33s
TypeScript Unit Tests (ubuntu-latest)	23s
Lint	17s
Smoke Tests	0s
Integration Tests (Multi-Root)	0s
E2E Tests	0s
Integration Tests	0s
	2m 13s

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