[Gradle] Use for Gradle IT tests custom location for kotlin.user.home

Such way, we could easily clean all persistent storage produced by
test runs.

^KT-58223 In Progress

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/CommonizerIT.kt

@@ -172,7 +172,7 @@ open class CommonizerIT : KGPBaseTest() {
         gradleVersion: GradleVersion,
         @TempDir tempDir: Path,
     ) {
-        nativeProject("commonizeCurlInterop", gradleVersion) {
+        nativeProject("commonizeCurlInterop", gradleVersion, buildOptions = defaultBuildOptions.copy(kotlinUserHome = null)) {
 
             configureCommonizerTargets()
 
@@ -546,7 +546,7 @@ open class CommonizerIT : KGPBaseTest() {
         gradleVersion: GradleVersion,
         @TempDir tempDir: Path,
     ) {
-        nativeProject("commonizeCurlInterop", gradleVersion) {
+        nativeProject("commonizeCurlInterop", gradleVersion, buildOptions = defaultBuildOptions.copy(kotlinUserHome = null)) {
             gradleProperties.append("kotlin.user.home=${tempDir.absolutePathString()}")
 
             configureCommonizerTargets()

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/testbase/BuildOptions.kt

@@ -18,6 +18,7 @@ import org.jetbrains.kotlin.gradle.report.BuildReportType
 import org.junit.jupiter.api.condition.OS
 import java.nio.file.Path
 import java.util.*
+import kotlin.io.path.absolutePathString
 
 data class BuildOptions(
     val logLevel: LogLevel = LogLevel.INFO,
@@ -53,6 +54,7 @@ data class BuildOptions(
     val compilerExecutionStrategy: KotlinCompilerExecutionStrategy? = null,
     val runViaBuildToolsApi: Boolean? = null,
     val konanDataDir: Path? = konanDir, // null can be used only if you are using custom 'kotlin.native.home' or 'org.jetbrains.kotlin.native.home' property instead of konanDir
+    val kotlinUserHome: Path? = testKitDir.resolve(".kotlin"),
 ) {
     val isK2ByDefault
         get() = KotlinVersion.DEFAULT >= KotlinVersion.KOTLIN_2_0
@@ -217,6 +219,10 @@ data class BuildOptions(
             arguments.add("-Pkonan.data.dir=${konanDataDir.toAbsolutePath().normalize()}")
         }
 
+        if (kotlinUserHome != null) {
+            arguments.add("-Pkotlin.user.home=${kotlinUserHome.absolutePathString()}")
+        }
+
         arguments.addAll(freeArgs)
 
         return arguments.toList()

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/testbase/testDsl.kt

@@ -489,7 +489,7 @@ val konanDir
 /**
  * On changing test kit dir location update related location in 'cleanTestKitCache' task.
  */
-private val testKitDir get() = Paths.get(".").resolve("build").resolve("testKitCache")
+internal val testKitDir get() = Paths.get(".").resolve("build").resolve("testKitCache")
 
 private val hashAlphabet: List<Char> = ('a'..'z') + ('A'..'Z') + ('0'..'9')
 private fun randomHash(length: Int = 15): String {