Use spotless to format remaining Kotlin files

Also: fix issue where some commented out Kotlin files are invalid.

buildSrc/build.gradle.kts

@@ -1,5 +1,18 @@
-import org.jetbrains.kotlin.config.JvmTarget
-
+/**
+ * Copyright © 2024 Apple Inc. and the Pkl project authors. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 plugins {
   `kotlin-dsl`
 }
@@ -7,9 +20,7 @@ plugins {
 dependencies {
   implementation(libs.downloadTaskPlugin)
   implementation(libs.spotlessPlugin)
-  implementation(libs.kotlinPlugin) {
-    exclude(module = "kotlin-android-extensions")
-  }
+  implementation(libs.kotlinPlugin) { exclude(module = "kotlin-android-extensions") }
   implementation(libs.shadowPlugin)
 
   // fix from the Gradle team: makes version catalog symbols available in build scripts
@@ -22,12 +33,4 @@ java {
   targetCompatibility = JavaVersion.VERSION_17
 }
 
-kotlin {
-  target {
-    compilations.configureEach {
-      kotlinOptions {
-        jvmTarget = "17"
-      }
-    }
-  }
-}
+kotlin { target { compilations.configureEach { kotlinOptions { jvmTarget = "17" } } } }