initial scaffolding for e2e, smoke, integration tests #1902

Job	Run time
Create VSIX	35s
TypeScript Unit Tests (ubuntu-latest)	40s
TypeScript Unit Tests (windows-latest)	1m 27s
Lint	18s
Smoke Tests (macos-latest)	41s
Smoke Tests (ubuntu-latest)	33s
Smoke Tests (windows-latest)	1m 14s
E2E Tests	0s
Integration Tests	0s
	5m 28s

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