[FIR] Prevent missing diagnostics on free lambdas

The change in `FirPsiDiagnosticTestGenerated.Resolve#testCast`
only highlights the existing
problem that we don't assign a
valid type to `_`.

^KT-58906 Fixed

compiler/testData/diagnostics/tests/functionLiterals/destructuringInLambdas/noExpectedType.fir.kt

@@ -24,7 +24,7 @@ fun bar() {
 
     y2 checkType { _<(A) -> Unit>() }
 
-    val z = { <!COMPONENT_FUNCTION_MISSING, COMPONENT_FUNCTION_MISSING!>(a: Int, b: String)<!> ->
+    val z = { <!COMPONENT_FUNCTION_MISSING, COMPONENT_FUNCTION_MISSING, VALUE_PARAMETER_WITH_NO_TYPE_ANNOTATION!>(a: Int, b: String)<!> ->
         a checkType { _<Int>() }
         b checkType { _<String>() }
     }