[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/operators/basicOverrideOnComplexHierarchy.kt

@@ -0,0 +1,76 @@
+// TARGET_BACKEND: JVM
+
+// FILE: Java1.java
+public class Java1 extends A { }
+
+// FILE: Java2.java
+public class Java2 extends A {
+    public void invoke(){};
+}
+
+// FILE: Java3.java
+public interface Java3 {
+    public void invoke();
+    public Java3 plus(Integer i);
+    public Integer get(Integer i);
+}
+
+// FILE: Java4.java
+public interface Java4 extends KotlinInterface{ }
+
+// FILE: 1.kt
+
+open class A {
+    open operator fun invoke() {}
+    open operator fun get(i: Int?): Int {
+        return 2
+    }
+    open operator fun plus(i: Int?): A {
+        return A()
+    }
+}
+class B : Java1()   //Kotlin ← Java ← Kotlin
+
+class C : Java2()   //Kotlin ← Java ← Kotlin with explicit override in java
+
+class D: Java1() {  //Kotlin ← Java ← Kotlin with explicit override
+    override fun invoke() { }
+    override fun get(i: Int?): Int {
+        return 3
+    }
+    override fun plus(i: Int?): A {
+        return A()
+    }
+}
+
+abstract class E : Java4    //Kotlin ← Java ← Kotlin ← Java
+
+class F: Java4 {    //Kotlin ← Java ← Kotlin ← Java with explicit override
+    override fun invoke() { }
+    override fun plus(i: Int?): Java3 {
+        return null!!
+    }
+    override fun get(i: Int?): Int {
+        return 4
+    }
+}
+
+interface KotlinInterface : Java3
+
+fun test(b: B, c: C, d: D, e: E, f: F) {
+    val k: Unit = b()
+    val k1: A = b + 1
+    val k2: Int = b[1]
+    val k3: Unit = c()
+    val k4: A = c + 1
+    val k5: Int = c[1]
+    val k6: Unit = d()
+    val k7: A = d + 1
+    val k8: Int = d[1]
+    val k9: Unit = e()
+    val k10: Java3 = e + 1
+    val k11: Int = e[1]
+    val k12: Unit = f()
+    val k13: Java3 = f + 1
+    val k14: Int = f[1]
+}