[FIR] Replace uninferred type variables and stub types during delegate inference

compiler/testData/diagnostics/tests/inference/builderInference/stubTypes/stubTypeReceiverRestriction.fir.kt

@@ -69,4 +69,4 @@ fun test6() {
         genericLambda { it.extension() }
         use(::extension)
     }
-}
+}

compiler/testData/diagnostics/tests/inference/builderInference/stubTypes/stubTypeReceiverRestrictionDisabled.fir.kt

@@ -70,4 +70,4 @@ fun test6() {
         genericLambda { it.extension() }
         use(::extension)
     }
-}
+}