FIR2IR: Repeat the K1 behavior: SAM conversion with 'in' projection

It would be more consistently to prohibit the behavior from the unmuted
test (see KT-52428), but it was decided to postpone the breaking change.

Unfortunately, it didn't work to make a test where for computing
star projections we would need to substitute other type parameters
because effectively, it's not allowed to have SAM conversion when
star projections/wildcard is based on a type parameter which bounds
use other type parameters.

^KT-53552 In progress

compiler/testData/ir/irText/firProblems/kt19251.fir.kt.txt

@@ -7,6 +7,5 @@ fun box(): String {
   return map.computeIfAbsent(p0 = fn, p1 = local fun <anonymous>(it: @EnhancedNullability Fun): @EnhancedNullability String {
     return "OK"
   }
- /*-> @EnhancedNullability Function<@EnhancedNullability Fun, @EnhancedNullability String> */) /*!! String */
+ /*-> @EnhancedNullability Function<Any?, @EnhancedNullability String> */) /*!! String */
 }
-