KT-33515: Remove Kotlin sources generated by KAPT

When KAPT is unable to run incrementally make sure to
clean directory that contains generated Kotlin sources.
This location is specified using '-Akapt.kotlin.generated'
option.

plugins/kapt3/kapt3-base/src/org/jetbrains/kotlin/kapt3/base/KaptContext.kt

@@ -73,6 +73,9 @@ open class KaptContext(val options: KaptOptions, val withJdk: Boolean, val logge
                 }
                 deleteAndCreate(options.sourcesOutputDir)
                 deleteAndCreate(options.classesOutputDir)
+                options.getKotlinGeneratedSourcesDirectory()?.let {
+                    deleteAndCreate(it)
+                }
             }
         } else {
             sourcesToReprocess = SourcesToReprocess.FullRebuild

plugins/kapt3/kapt3-base/src/org/jetbrains/kotlin/kapt3/base/KaptOptions.kt

@@ -9,6 +9,8 @@ import org.jetbrains.kotlin.kapt3.base.incremental.SourcesToReprocess
 import java.io.File
 import java.nio.file.Files
 
+private const val KAPT_KOTLIN_GENERATED_OPTION_NAME = "kapt.kotlin.generated"
+
 class KaptOptions(
     val projectBaseDir: File?,
     val compileClasspath: List<File>,
@@ -80,6 +82,11 @@ class KaptOptions(
             )
         }
     }
+
+    fun getKotlinGeneratedSourcesDirectory(): File? {
+        val value = processingOptions[KAPT_KOTLIN_GENERATED_OPTION_NAME] ?: return null
+        return File(value).takeIf { it.exists() }
+    }
 }
 
 interface KaptFlags {