Rewrite IDE check whether serialization plugin is enabled

In a such way so it wouldn't check for actual JAR file and wouldn't touch filesystem.
Fixes KT-32346

plugins/kotlin-serialization/kotlin-serialization-ide/src/org/jetbrains/kotlinx/serialization/idea/KotlinSerializationImportHandler.kt

@@ -16,14 +16,20 @@
 
 package org.jetbrains.kotlinx.serialization.idea
 
-import org.jetbrains.kotlin.utils.PathUtil
 import org.jetbrains.kotlin.cli.common.arguments.CommonCompilerArguments
 import org.jetbrains.kotlin.idea.facet.KotlinFacet
+import org.jetbrains.kotlin.utils.PathUtil
 import java.io.File
 
 internal object KotlinSerializationImportHandler {
+    private const val pluginJpsJarName = "kotlinx-serialization-compiler-plugin.jar"
+
     val PLUGIN_JPS_JAR: String
-        get() = File(PathUtil.kotlinPathsForIdeaPlugin.libPath, "kotlinx-serialization-compiler-plugin.jar").absolutePath
+        get() = File(PathUtil.kotlinPathsForIdeaPlugin.libPath, pluginJpsJarName).absolutePath
+
+    fun isPluginJarPath(path: String): Boolean {
+        return path.endsWith(pluginJpsJarName)
+    }
 
     fun modifyCompilerArguments(facet: KotlinFacet, buildSystemPluginJar: String) {
         val facetSettings = facet.configuration.settings

plugins/kotlin-serialization/kotlin-serialization-ide/src/org/jetbrains/kotlinx/serialization/idea/SerializationSwitchUtils.kt

@@ -15,7 +15,7 @@ fun <T> getIfEnabledOn(clazz: ClassDescriptor, body: () -> T): T? {
     val module = clazz.module.getCapability(ModuleInfo.Capability)?.unwrapModuleSourceInfo()?.module ?: return null
     val facet = KotlinFacet.get(module) ?: return null
     val pluginClasspath = facet.configuration.settings.compilerArguments?.pluginClasspaths ?: return null
-    if (pluginClasspath.none { it == KotlinSerializationImportHandler.PLUGIN_JPS_JAR }) return null
+    if (pluginClasspath.none(KotlinSerializationImportHandler::isPluginJarPath)) return null
     return body()
 }