Ensure static frameworks are embedded by default

[daltonclaybrook]

Resolves #1627

[yonaskolb]

Thanks @daltonclaybrook. I added that the previous behaviour happens on older declared xcode versions.

[marcos-strava]

Hi @daltonclaybrook and @yonaskolb this PR seems to have broken our project somehow. Our project is large and complex with dozens of xcodegen files, so it's unclear what we need to update in our xcodegen files to get this back on track.

The associated issue describes that since Xcode 15 the embed setting maybe have been happening automatically, but clearly something in our project isn't doing it 😅

Do you have some notes or suggestions of what needs to change ideally?