FIR IDE: introduce common function to mute tests

idea/idea-test-framework/test/org/jetbrains/kotlin/idea/test/KotlinLightCodeInsightFixtureTestCase.kt

@@ -57,6 +57,7 @@ import java.io.File
 import java.io.IOException
 import java.util.*
 import kotlin.reflect.full.findAnnotation
+import java.nio.file.Path
 
 abstract class KotlinLightCodeInsightFixtureTestCase : KotlinLightCodeInsightFixtureTestCaseBase() {
 
@@ -68,6 +69,8 @@ abstract class KotlinLightCodeInsightFixtureTestCase : KotlinLightCodeInsightFix
 
     protected fun testDataFile(): File = testDataFile(fileName())
 
+    protected fun testDataFilePath(): Path = testDataFile().toPath()
+
     protected fun testPath(fileName: String = fileName()): String = testDataFile(fileName).toString()
 
     protected fun testPath(): String = testPath(fileName())