Check if reverse client ID is a registered URL scheme before setting callback scheme #7211
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After OAuth provisioning is deferred, the client ID may still be provided in the plist file after Google Sign-in is enabled. Therefore, the presence of the client ID itself is not enough to determine whether to use the client ID or the app ID in generic IDP and phone auth reCAPTCHA fallback flows. Instead, we need to check first if the reverse client ID is registered as a custom URL scheme.