Merge foreign annotation tests for sources and binaries into single directory

compiler/testData/diagnostics/foreignAnnotationsTests/java8Tests/misc/nullableVarargsOverrides.kt

@@ -0,0 +1,21 @@
+// SOURCE_RETENTION_ANNOTATIONS
+// FILE: BaseClass.java
+import org.checkerframework.checker.nullness.qual.*;
+
+public class BaseClass {
+    public void loadCache(@Nullable Object... args) {}
+}
+
+// FILE: main.kt
+class A : BaseClass() {
+    override fun loadCache(vararg args: Any?) {
+        super.loadCache(*args)
+    }
+}
+
+class B : BaseClass() {
+    // org.checkerframework.checker.nullness.qual.Nullable has @Target TYPE_USE, so it affects only elements type
+    <!NOTHING_TO_OVERRIDE!>override<!> fun loadCache(vararg args: Any) {
+        super.loadCache(*args)
+    }
+}