[Wasm] PL tests implementation for Wasm target

Fixed #KT-58088

compiler/testData/klib/partial-linkage/externalDeclarationsKJS/lib2/l2.kt

@@ -0,0 +1,26 @@
+class RegularClassInheritedFromAbstractExternalClass : AbstractExternalClass() {
+    override fun abstractFunction() = "RegularClassInheritedFromAbstractExternalClass.abstractFunction"
+    override fun removedAbstractFunction() = "RegularClassInheritedFromAbstractExternalClass.removedAbstractFunction"
+}
+
+fun RegularClassInheritedFromAbstractExternalClass.callRemovedFunction() = removedFunction()
+
+open external class OpenExternalClass {
+    fun function(): String
+}
+
+@Suppress("INTERFACE_WITH_SUPERCLASS")
+external interface ExternalInterfaceInheritedFromOpenExternalClass : OpenExternalClass {
+    fun abstractFunction(): String
+}
+
+class RegularClassInheritedFromExternalInterfaceInheritedFromOpenExternalClass :
+    ExternalInterfaceInheritedFromOpenExternalClass,
+    /* Note: Have to explicitly inherit from 'OpenExternalClass' becase otherwise JS codegen sees that
+     * class 'RegularClassInheritedFromExternalInterfaceInheritedFromOpenExternalClass' is inherited only from
+     * interface 'ExternalInterfaceInheritedFromOpenExternalClass' and does not figure out that a bridge has to be
+     * generated for function 'function' inherited from 'OpenExternalClass'.
+     */
+    OpenExternalClass() {
+    override fun abstractFunction(): String = "RegularClassInheritedFromExternalInterfaceInheritedFromOpenExternalClass.abstractFunction"
+}