Add watcher for pip installs #2232

Job	Run time
TypeScript Unit Tests (ubuntu-latest)	19s
TypeScript Unit Tests (windows-latest)	1m 9s
Create VSIX	31s
Lint	20s
E2E Tests	0s
Integration Tests	0s
Smoke Tests	0s
Integration Tests (Multi-Root)	0s
	2m 19s

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