bugfix (auth-compat): reliably detect Capacitor/Cordova environment

[dpa99c]

This PR resolves #8755 by adding a check for the Capacitor/cordova global namespaces on the window object as an alternative to checking the user agent string to confirm whether the current runtime environment is a Webview withing a Capacitor/Cordova hybrid mobile app.

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[dlarocque]

Hi @dpa99c, thanks you for opening a PR! Could you please sign the Google CLA, and create a changeset with yarn changeset add? I believe this should be patch bump for @firebase/auth.