Include META-INF/extensions/compiler.xml into IDEA plugin

This fixes tests and IDEA run configurations broken in 95f9884799

prepare/idea-plugin/build.gradle.kts

@@ -92,6 +92,9 @@ dependencies {
 
 val jar = runtimeJar(task<ShadowJar>("shadowJar")) {
     from(files("$rootDir/resources/kotlinManifest.properties"))
+    from(files("$rootDir/compiler/cli/src")) {
+        include("META-INF/extensions/compiler.xml")
+    }
     from(packedJars)
     for (p in projectsToShadow) {
         dependsOn("$p:classes")