K2: Postpone inference forks resolution until FULL completion

It helps to use expected type information when choosing the branch
even in the nested calls

^KT-43296 In Progress

compiler/resolution.common/src/org/jetbrains/kotlin/resolve/calls/inference/model/NewConstraintSystemImpl.kt

@@ -276,6 +276,7 @@ class NewConstraintSystemImpl(
         storage.errors.addAll(otherSystem.errors)
         storage.fixedTypeVariables.putAll(otherSystem.fixedTypeVariables)
         storage.postponedTypeVariables.addAll(otherSystem.postponedTypeVariables)
+        storage.constraintsFromAllForkPoints.addAll(otherSystem.constraintsFromAllForkPoints)
     }
 
     // ResultTypeResolver.Context, ConstraintSystemBuilder