[Gradle] Move konan.data.dir for tests into <repo>/build and normalize the path

This should solve the problem on Windows CI with too long paths in Kotlin/Native integration tests

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

@@ -214,7 +214,7 @@ data class BuildOptions(
         }
 
         konanDataDir?.let {
-            arguments.add("-Pkonan.data.dir=${konanDataDir.absolutePathString()}")
+            arguments.add("-Pkonan.data.dir=${konanDataDir.toAbsolutePath().normalize()}")
         }
 
         arguments.addAll(freeArgs)

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

@@ -447,7 +447,7 @@ private fun TestProject.withBuildSummary(
     }
 }
 
-val konanDir get() = Paths.get(".").resolve("build").resolve(".konan")
+val konanDir get() = Paths.get(".").resolve("../../../build").resolve("konan-for-gradle-tests")
 
 /**
  * On changing test kit dir location update related location in 'cleanTestKitCache' task.