Remove binary test data from completion tests

Delete CompileBinaryTestData script, since there are no tests with binary test
data left in the repository

idea/testData/completion/basic/custom/TopLevelNonImportedExtFunSrc/source.kt

@@ -0,0 +1,9 @@
+package abc
+
+public fun abcdAAA1(): Unit {}
+
+public fun abcdBBB2(i: Int) {}
+
+public fun Int.abcdCCC3() {}
+
+public fun Int.abcdDDD4(i: Int) {}