Add Edge versions for api.Window.onbeforeinstallprompt (#13491)
Add Edge versions for api.Window.onbeforeinstallprompt (#13491)

This PR adds real values for Microsoft Edge for the `onbeforeinstallprompt` member of the `Window` API, based upon manual testing.

Test Code Used: `window.onbeforeinstallprompt`
chrisdavidmills/browser-compat-data,mdn/browser-compat-data,chrisdavidmills/browser-compat-data,mdn/browser-compat-data