chore: add execProcess wrapper and refactor poetryUtils (Fixes #1239) #1962

Job	Run time
Create VSIX	31s
TypeScript Unit Tests (windows-latest)	1m 32s
Lint	18s
TypeScript Unit Tests (ubuntu-latest)	20s
E2E Tests	0s
Smoke Tests	0s
Integration Tests	0s
	2m 41s

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