N.B. This implementation does not 100% prevent conflicts or resolve
alterations when shortening functions.
To guarantee that,
we would need to carefully consider all the references in the file,
and to check whether they have changed their resolve in the presence
of a new import.
This is not trivial and will be approached separately under a different
task.
^KTIJ-27841 Fixed
This way, even if the whole qualifier is not selected, but some of its
parts are, the reference shortener will correctly find and shorten
those parts
^KTIJ-28080 Fixed
Utilize `FirSamResolver` to obtain the potential SAM constructor
from the classifier
Also, accept K2_SYNTHETIC_RESOLVED in the `resolveUnqualifiedAccess`,
since this is the kind of resolve success which corresponds to the
SAM constructor call resolution
^KTIJ-28167 Fixed
Dmitrii Gridin