Reduce boilerplate in CompileKotlinAgainstCustomBinariesTest

Check against output.txt in compileKotlin; adapt test data of some tests

compiler/testData/compileKotlinAgainstCustomBinaries/noWarningsOnJavaKotlinInheritance/library/JavaInterface.java

@@ -0,0 +1,3 @@
+public interface JavaInterface {
+    void foo(int javaName);
+}

compiler/testData/compileKotlinAgainstCustomBinaries/noWarningsOnJavaKotlinInheritance/noWarningsOnJavaKotlinInheritance.java

@@ -1,3 +0,0 @@
-interface JavaInterface {
-    void foo(int javaName);
-}