[Gradle, JS] Deprecation of BOTH and LEGACY consts

^KT-55593 fixed

libraries/tools/kotlin-gradle-plugin-api/src/common/kotlin/org/jetbrains/kotlin/gradle/plugin/KotlinJsCompilerType.kt

@@ -8,8 +8,12 @@ package org.jetbrains.kotlin.gradle.plugin
 import java.util.*
 
 enum class KotlinJsCompilerType {
+    @Deprecated("Legacy compiler is deprecated. Migrate your project to the new IR-based compiler")
     LEGACY,
+
     IR,
+
+    @Deprecated("Legacy compiler is deprecated. Migrate your project to the new IR-based compiler")
     BOTH;
 
     companion object {

libraries/tools/kotlin-gradle-plugin-api/src/common/kotlin/org/jetbrains/kotlin/gradle/plugin/KotlinJsCompilerTypeHolder.kt

@@ -3,6 +3,8 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+@file:Suppress("DEPRECATION")
+
 package org.jetbrains.kotlin.gradle.plugin
 
 interface KotlinJsCompilerTypeHolder {
@@ -12,12 +14,14 @@ interface KotlinJsCompilerTypeHolder {
         get() = compilerTypeFromProperties ?: KotlinJsCompilerType.IR
 
     // Necessary to get rid of KotlinJsCompilerType import in build script
+    @Deprecated("Legacy compiler is deprecated. Migrate your project to the new IR-based compiler")
     val LEGACY: KotlinJsCompilerType
         get() = KotlinJsCompilerType.LEGACY
 
     val IR: KotlinJsCompilerType
         get() = KotlinJsCompilerType.IR
 
+    @Deprecated("Legacy compiler is deprecated. Migrate your project to the new IR-based compiler")
     val BOTH: KotlinJsCompilerType
         get() = KotlinJsCompilerType.BOTH
 }