refactor: shared webview IPC helpers with enforced exhaustiveness #2451

Job	Run time
Package	33s
Unit Test (Windows, Electron latest)	2m 23s
Integration Test (Windows, VS Code stable)	2m 17s
Unit Test (Linux, Electron 37)	1m 5s
Integration Test (Linux, VS Code stable)	50s
Lint	40s
Unit Test (macOS, Electron latest)	56s
Integration Test (macOS, VS Code stable)	1m 10s
Integration Test (Linux, VS Code 1.106.0)	43s
Unit Test (Linux, Electron latest)	54s
	11m 31s

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