fix(macCatalyst): assume a provided UDID is valid

[mikehardy]

Summary

This patch works around a problem where macCatalyst UDIDs are not correct when fetched from system, so attempting to find them in list of UDIDs always fails and macCatalyst apps will not start

It basically just assumes - but with an informative warning - that if you specify a UDID you know what you're doing and it will try to use the one you specified instead of simply erroring out.

• Fixes Not possible to specify macCatalyst UDID as run target #2313

Test Plan

I've been carrying this patch around forever. It's the only way I can get my build demonstrator for react-native-firebase to correctly build-test and run macCatalyst version of react-native + react-native-firebase

Should be noted this very same build test is the source of a large number of macCatalyst build fixes over the years, it's been quite helpful in upstreaming things to make macCatalyst work, this is just another one

https://github.com/mikehardy/rnfbdemo/blob/0f16f47dc9823a592673d849d981db1fb8a96bf9/patches/%40react-native-community%2Bcli-platform-apple%2B15.0.1.patch#L1-L24

Checklist

• Documentation is up to date.
• Follows commit message convention described in CONTRIBUTING.md.
• For functional changes, my test plan has linked these CLI changes into a local react-native checkout (instructions).

[mikehardy]

The CI failure seems unrelated to this PR

[cipolleschi]

It makes sense to me.