EditMenu: differentiate external widgets from Cockpit's own #3043

Job	Run time
Test	59s
deploy-blueos-extension	1m 4s
deploy-flatpak (ubuntu-latest, linux, x86_64, flatpak)	10m 6s
deploy-electron (macos-13, mac, x64, dmg, latest-mac.yml)	6m 45s
deploy-flatpak (ubuntu-24-arm, linux, arm64, flatpak)	13m 19s
deploy-cloud	0s
deploy-electron (ubuntu-latest, linux, x86_64, AppImage, latest-linux.yml)	2m 41s
deploy-page	44s
deploy-electron (ubuntu-24-arm, linux, arm64, AppImage, latest-linux-arm64.yml)	5m 58s
deploy-electron (windows-latest, win, x64, exe, latest.yml)	5m 51s
	47m 27s

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