[IR][tests] Add tests for removal-of-overridden open callable case

compiler/testData/klibABI/removeOpenFunction/lib1/l1.kt

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+open class C {
+    open fun foo(): String = "FAIL1"
+}
+
+interface I {
+    fun foo(): String = "FAIL2"
+}

compiler/testData/klibABI/removeOpenFunction/lib1/l1.kt.1

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+open class C
+interface I

compiler/testData/klibABI/removeOpenFunction/lib1/module.info

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+STEP 0:
+    dependencies: stdlib
+STEP 1:
+    dependencies: stdlib
+    modifications:
+        U : l1.kt.1 -> l1.kt

compiler/testData/klibABI/removeOpenFunction/lib2/l2.kt

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+class C2 : C() {
+    override fun foo(): String = "O" // does not call super
+}
+
+class I2 : I {
+    override fun foo(): String = "K" // does not call super
+}

compiler/testData/klibABI/removeOpenFunction/lib2/module.info

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+STEP 0:
+    dependencies: stdlib, lib1

compiler/testData/klibABI/removeOpenFunction/main/m.kt

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+fun box(): String {
+    return C2().foo() + I2().foo()
+}

compiler/testData/klibABI/removeOpenFunction/main/module.info

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+STEP 0:
+    dependencies: stdlib, lib1, lib2

compiler/testData/klibABI/removeOpenFunction/project.info

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+MODULES: lib1, lib2, main
+
+STEP 0:
+    libs: lib1, lib2, main
+
+STEP 1:
+    libs: lib1