Address warning diagnostics (#1395)

This addressess various warning diagnostics throughout the codebase.

pkl-codegen-kotlin/src/main/kotlin/org/pkl/codegen/kotlin/KotlinCodeGenerator.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright © 2024-2025 Apple Inc. and the Pkl project authors. All rights reserved.
+ * Copyright © 2024-2026 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.
@@ -13,6 +13,8 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+@file:Suppress("unused")
+
 package org.pkl.codegen.kotlin
 
 import com.squareup.kotlinpoet.*
@@ -66,6 +68,7 @@ class KotlinCodeGenerator(
     private val STRING = String::class.asClassName()
     private val ANY_NULL = ANY.copy(nullable = true)
     private val NOTHING = Nothing::class.asClassName()
+    @Suppress("RemoveRedundantQualifierName")
     private val KOTLIN_PAIR = kotlin.Pair::class.asClassName()
     private val COLLECTION = Collection::class.asClassName()
     private val LIST = List::class.asClassName()

pkl-codegen-kotlin/src/test/kotlin/org/pkl/codegen/kotlin/KotlinCodeGeneratorTest.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright © 2024-2025 Apple Inc. and the Pkl project authors. All rights reserved.
+ * Copyright © 2024-2026 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.
@@ -2054,7 +2054,7 @@ class KotlinCodeGeneratorTest {
   }
 
   private fun Map<String, String>.validateContents(
-    vararg assertions: kotlin.Pair<String, List<String>>
+    @Suppress("RemoveRedundantQualifierName") vararg assertions: kotlin.Pair<String, List<String>>
   ) {
     val files = toMutableMap()
 
@@ -2079,7 +2079,7 @@ class KotlinCodeGeneratorTest {
   }
 
   private fun KotlinCodeGeneratorOptions.generateFiles(
-    vararg pklModules: kotlin.Pair<String, String>
+    @Suppress("RemoveRedundantQualifierName") vararg pklModules: kotlin.Pair<String, String>
   ): Map<String, String> =
     generateFiles(*pklModules.map { (name, text) -> PklModule(name, text) }.toTypedArray())