[FE] Add ability to set compatibility of plugin with K2 in ComponentRegistrar

plugins/scripting/scripting-compiler/src/org/jetbrains/kotlin/scripting/compiler/plugin/pluginRegisrar.kt

@@ -43,6 +43,11 @@ private fun <T : Any> ProjectExtensionDescriptor<T>.registerExtensionIfRequired(
 }
 
 class ScriptingCompilerConfigurationComponentRegistrar : ComponentRegistrar {
+    // Actually this plugin don't support K2, but it automatically registered in some cases,
+    //   so for now this flag is just a stub
+    override val supportsK2: Boolean
+        get() = true
+
     override fun registerProjectComponents(project: MockProject, configuration: CompilerConfiguration) {
         val messageCollector = configuration.get(CLIConfigurationKeys.MESSAGE_COLLECTOR_KEY)
         val hostConfiguration = ScriptingHostConfiguration(defaultJvmScriptingHostConfiguration) {
@@ -84,4 +89,4 @@ private inline fun withClassloadingProblemsReporting(messageCollector: MessageCo
             System.err.println(msg)
         }
     }
-}
+}