FE: don't lose annotations on Java primitive arrays

but only use them to enhance for warnings for now.

^KT-48861 Fixed

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

@@ -0,0 +1,12 @@
+// FIR_IDENTICAL
+// SKIP_TXT
+// !LANGUAGE: +EnhanceNullabilityOfPrimitiveArrays
+// FILE: J.java
+import org.jetbrains.annotations.Nullable;
+
+public interface J {
+    int @Nullable [] foo();
+}
+
+// FILE: main.kt
+fun bar(j: J) = j.foo()<!UNSAFE_CALL!>.<!>iterator()