[vcpkg/scripts] deprecate vcpkg_fail_port_install

[Neumann-A]

• too restrictive
• might only apply to default triplets
• might block community triplets (e.g. mingw triplets)
• was added before the introduction of the supports field and the ci.baseline

[strega-nil]

Sounds good to me! If you like you can open a PR :)

[autoantwort]

When the supports field becomes a warning/error for the user this can definitive by done

[dg0yt]

But only if there is also a supports field for features.