[iOS/MacOS] Warn when using deprecated framework build commands - #191644

…ter#191644)

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Adds migration warnings to the deprecated flutter build ios-framework
and flutter build macos-framework commands. It warns users of the
replacement flutter build swift-package command and points to [migration
documentation](https://docs.flutter.dev/add-to-app/ios/project-setup).
Added test + tested locally

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Fixes flutter#191367.

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---------

Co-authored-by: Victoria Ashworth <[email protected]>