This makes sense as such callables do not conflict on their use-sites,
because a hidden callable loses to a non-hidden one when doing
overload resolution.
We achieve this by not considering such callables as conflicting when
collecting them in FirDeclarationCollector.
A callable is hidden if it will be hidden from the overload resolution,
meaning it has a `Deprecated` or `DeprecatedSinceKotlin` annotation.
NB: this also impacts `REDECLARATION` diagnostic for properties, as they
can also be marked as `Deprecated`.
NB: this change ignores local callables, as they are ignored
w.r.t. `Deprecated` in K2.
^KT-22004 Fixed
marat.akhin