[IC] Add test for potential sam change in kotlin-java interop

JPS tests were fixed on IJ side during implementation of JPS on graph

Relates to KT-21534

jps/jps-plugin/testData/incremental/withJava/javaUsedInKotlin/potentialSamAdapter/main.kt

@@ -0,0 +1,8 @@
+fun JavaClass.foo(x: String) {
+    println("extension")
+}
+
+fun main(args: Array<String>) {
+    JavaClass().foo("str")
+}
+//KT-21534