K2: Don't lose constraint errors in the builder inference session

Pass constraint errors from the integration system into a candidate to
make sure it is reported later.

Related to KT-59426, KT-59437, KT-53749
#KT-55168 Submitted

compiler/testData/diagnostics/testsWithStdLib/builderInference/buildListRemoveAddInBranches.fir.kt

@@ -1,8 +1,8 @@
 // ISSUE: KT-55168
-fun foo(arg: Boolean) = buildList {
+fun foo(arg: Boolean) = <!NEW_INFERENCE_ERROR!>buildList {
     if (arg) {
         removeLast()
     } else {
         add(42)
     }
-}
+}<!>