Add React webview system with pnpm workspaces #1884

Job	Run time
Lint	59s
Unit Test (Electron 32)	1m 18s
Integration Test (VS Code stable)	59s
Unit Test (Electron latest)	1m 9s
Integration Test (VS Code 1.95.0)	1m 4s
Package	26s
	5m 55s

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