[JVM IR] ForLoopsLowering: Keep IMPLICIT_NOTNULL type-casts in next()

and `componentN()` calls.

There were issues when we have iterables from Java where the element
type has "not null" type information.

compiler/testData/codegen/box/ranges/javaInterop/javaCollectionOfExplicitNotNull.kt

@@ -0,0 +1,42 @@
+// !LANGUAGE: +StrictJavaNullabilityAssertions
+// TARGET_BACKEND: JVM
+// IGNORE_BACKEND_FIR: JVM_IR
+// WITH_RUNTIME
+
+// FILE: box.kt
+import kotlin.test.*
+
+fun box(): String {
+    val actualValues = mutableListOf<Int>()
+    for (i in J.listOfNotNull()) {
+        actualValues += i
+    }
+    assertEquals(listOf(42, -42), actualValues)
+    return "OK"
+}
+
+// FILE: J.java
+import java.util.*;
+import org.jetbrains.annotations.*;
+
+public class J {
+    public static List<@NotNull Integer> listOfNotNull() {
+        List<Integer> list = new ArrayList<>();
+        list.add(42);
+        list.add(-42);
+        return list;
+    }
+}
+
+// FILE: NotNull.java
+package org.jetbrains.annotations;
+
+import java.lang.annotation.*;
+
+// org.jetbrains.annotations used in the compiler is version 13, whose @NotNull does not support the TYPE_USE target (version 15 does).
+// We're using our own @org.jetbrains.annotations.NotNull for testing purposes.
+@Documented
+@Retention(RetentionPolicy.CLASS)
+@Target({ElementType.METHOD, ElementType.FIELD, ElementType.PARAMETER, ElementType.LOCAL_VARIABLE, ElementType.TYPE_USE})
+public @interface NotNull {
+}