[FIR] Don't approximate captured types

This fixes some type argument mismatch errors caused by a captured type
being approximated and then captured again.
Some places need to be adapted to work with captured types that
previously only worked with approximated types.

#KT-62959 Fixed

compiler/testData/ir/irText/expressions/sam/genericSamProjectedOut.fir.kt.txt

@@ -16,7 +16,7 @@ fun test() {
     return Unit
   }
  /*-> Hello<out @FlexibleNullability String?> */)
-  a.set(i = 0, hello = local fun <anonymous>(it: @FlexibleNullability String?) {
+  a /*as SomeJavaClass<out @FlexibleNullability String?> */.set(i = 0, hello = local fun <anonymous>(it: @FlexibleNullability String?) {
     return Unit
   }
  /*-> Hello<out @FlexibleNullability String?> */)