[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/generics/basicWilcardsOverride.kt

@@ -0,0 +1,69 @@
+// TARGET_BACKEND: JVM
+// FULL_JDK
+// WITH_STDLIB
+
+// FILE: Java1.java
+import java.util.*;
+
+public class Java1 {
+    public void foo(List<? extends Number> a) { }
+    public List<? extends Number> bar(){
+        return null;
+    }
+    public void foo2(List<? super Number> a) { }
+    public List<? super Number> bar2(){
+        return null;
+    }
+
+    public void foo3(List<?> a) {}
+    public List<?> bar3(){
+        return null;
+    }
+}
+
+// FILE: test.kt
+class A : Java1()
+
+class B: Java1(){
+    override fun foo(a: MutableList<out Number>?) { }
+    override fun bar(): MutableList<out Number> {
+        return null!!
+    }
+
+    override fun foo2(a: MutableList<in Number>?) { }
+    override fun bar2(): MutableList<in Number> {
+        return null!!
+    }
+
+    override fun foo3(a: MutableList<*>?) { }
+    override fun bar3(): MutableList<*> {
+        return null!!
+    }
+}
+
+fun test(a: A, b: B){
+    a.foo(null)
+    a.foo(mutableListOf(null))
+    a.foo(listOf(1))
+    a.bar()
+    a.foo2(null)
+    a.foo2(mutableListOf(null))
+    a.foo2(mutableListOf(1.1))
+    a.bar2()
+    a.foo3(null)
+    a.foo3(mutableListOf(null))
+    a.foo3(listOf(null))
+    a.foo3(listOf(""))
+    a.bar3()
+    b.foo(null)
+    b.foo(mutableListOf(1))
+    b.bar()
+    b.foo2(null)
+    b.foo2(mutableListOf(null))
+    b.foo2(mutableListOf(1.1))
+    b.bar2()
+    b.foo3(null)
+    b.foo3(mutableListOf(null))
+    b.foo3(mutableListOf(""))
+    b.bar3()
+}