Process explorer: update name for service worker process

Steps to Reproduce:

1. Open any webview, ex: open an extension page
2. Open process explorer
3. There will now be a window process with no associated title, it can be mistaken for workbench

Inspecting the window via remote debugging, the following are the location information

"vscode-webview://extensioneditor/service-worker.js?id=bd03d4e0-fea8-4a03-8b…de-resource.vscode-webview.net&parentOrigin=vscode-file%3A%2F%2Fvscode-app"

Service workers are also spawned as renderer processes so it would be good to differentiate them in the explorer.