[Test] KT-61360: add tests for the IrFakeOverrideBuilder

Add tests for fake overrides with focus on java interoperability

Co-authored-by: Aleksandra Arsenteva <aleksandra.arsenteva@jetbrains.com>

compiler/testData/ir/irText/fakeOverrides/annotations/basicNullabilityAnnotationOverride.kt

@@ -0,0 +1,64 @@
+// TARGET_BACKEND: JVM
+
+// FILE: Java1.java
+import org.jetbrains.annotations.Nullable;
+
+public class Java1 {
+    @Nullable
+    public String nullableString = "";
+    @Nullable
+    public String bar() {
+        return nullableString;
+    }
+    public void foo(@Nullable String s) {}
+}
+
+// FILE: Java2.java
+import org.jetbrains.annotations.NotNull;
+
+public interface Java2  {
+    @NotNull
+    public String nullableString = "";
+    @NotNull
+    public String bar();
+    public void foo(@NotNull String s);
+}
+
+// FILE: 1.kt
+
+class A : Java1()
+
+class B : Java1() {
+    override fun foo(s: String?) { }
+    override fun bar(): String {
+        return null!!
+    }
+}
+
+abstract class C: Java2
+
+class D : Java2 {
+    override fun bar(): String {
+        return ""
+    }
+    override fun foo(s: String) { }
+}
+
+
+fun test(a:A, b: B, c: C, d: D) {
+    val k: String? = a.nullableString
+    val k2: String? = a.bar()
+    a.foo(null)
+    a.foo("")
+
+    val k3: String? = b.nullableString
+    val k4: String = b.bar()
+    b.foo(null)
+    b.foo("")
+
+    val k5: String = c.bar()
+    c.foo("")
+
+    val k6: String = d.bar()
+    d.foo("")
+}