Spawn the extension host directly from the main process because fork() is now fast again #150002
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fork()used to block the event loop for up to 500ms on macOS. This has now been addressed in newer Electron versions, so it is no longer necessary to have a node worker that spawns the extension host, we can spawn the extension host directly from the main process. This will help with adopting theUtilityProcessElectron proposal which is only available on the main process.