bug#44327: `guix install` doesn't warn about collison in profile

[Zhu Zihao]

In commit ba60bbd4370570ff03a16c63af051be06f22658e. Try command

  guix install emacs && guix install emacs-xwidgets

These two packages are conflict with each other, but I can't see any
warning message emitted(It should emit some because profile-derivation
use union-build).

I also suggest to raise an error when conflict detected during building
profile to force user to resolve it.


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Zihao

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