KT-57927: Fix deserialization of K2JVMCompilerArguments in FP/MT tests

Due to changes in 9dcd40d7b7
classpath and pluginClasspath arguments become Arrays
Now we need to update arguments representation to properly deserialize
it

^KT-57927

compiler/fir/modularized-tests/tests/org/jetbrains/kotlin/fir/AbstractModularizedTest.kt

@@ -149,8 +149,42 @@ abstract class AbstractModularizedTest : KtUsefulTestCase() {
         return modules.map { node -> loadModule(node).also { it.arguments = arguments } }
     }
 
+    // TODO: remove once support for snapshot 2022 is ended
+    private fun updateCompilerArgumentsXml(element: Element) {
+        fun convertOptionToList(optionElement: Element) {
+            if (optionElement.getAttribute("value") == null) return
+            val paths = optionElement.getAttributeValue("value").split(":")
+
+            optionElement.removeAttribute("value")
+
+            val listElement = Element("list")
+            paths.forEach { path ->
+                val pathElement = Element("option")
+                pathElement.setAttribute("value", path)
+                listElement.addContent(pathElement)
+            }
+
+            optionElement.addContent(listElement)
+        }
+
+
+        fun findOptionElements(parentElement: Element, optionName: String): List<Element> {
+            return parentElement.getChildren("option")
+                .filter { it.getAttributeValue("name") == optionName }
+        }
+
+        // See KT-57927
+        findOptionElements(element, "classpath").forEach {
+            convertOptionToList(it)
+        }
+        findOptionElements(element, "pluginClasspath").forEach {
+            convertOptionToList(it)
+        }
+    }
+
     private fun loadCompilerArguments(argumentsRoot: Element): CommonCompilerArguments? {
         val element = argumentsRoot.children.singleOrNull() ?: return null
+        updateCompilerArgumentsXml(element)
         return when (element.name) {
             "K2JVMCompilerArguments" -> K2JVMCompilerArguments().also { XmlSerializer.deserializeInto(it, element) }
             else -> null