[SamWithReceiver] Fix test configuration and testdata

plugins/sam-with-receiver/testData/diagnostics/samConversionSimple.fir.kt

@@ -0,0 +1,20 @@
+// FILE: Sam.java
+@SamWithReceiver
+public interface Sam {
+    void run(String a);
+}
+
+// FILE: Exec.java
+public class Exec {
+    void exec(Sam sam) {}
+}
+
+// FILE: test.kt
+annotation class SamWithReceiver
+
+fun test() {
+    val e = Exec()
+
+    e.exec <!ARGUMENT_TYPE_MISMATCH!>{ <!CANNOT_INFER_PARAMETER_TYPE!>a<!> -> System.out.<!OVERLOAD_RESOLUTION_AMBIGUITY!>println<!>(a) }<!>
+    e.exec { System.out.println(this) }
+}