K2: Set proper source for implicit it/receiver parameter

Previously, error types on those implicit parameters were being lost.

Changed test data is only partly here
(only parts that are considered to be correct).

Other ones (new green-to-red changes) should belong to the next commit
and will be fixed soon (as a part of PCLA).

compiler/testData/diagnostics/tests/builderInference/issues/kt49263.fir.kt

@@ -2,9 +2,9 @@
 // CHECK_TYPE_WITH_EXACT
 
 fun test() {
-    val targetType = <!NEW_INFERENCE_NO_INFORMATION_FOR_PARAMETER!>buildPostponedTypeVariable<!> {
+    val targetType = <!NEW_INFERENCE_NO_INFORMATION_FOR_PARAMETER!>buildPostponedTypeVariable<!> <!CANNOT_INFER_PARAMETER_TYPE!>{
         consumeTargetType(<!CANNOT_INFER_PARAMETER_TYPE!>this<!>)
-    }
+    }<!>
     // exact type equality check — turns unexpected compile-time behavior into red code
     // considered to be non-user-reproducible code for the purposes of these tests
     checkExactType<TargetType>(targetType)