Build: got rid of @TestOnly annotations on fields and classes

compiler/light-classes/src/org/jetbrains/kotlin/asJava/classes/ultraLightPsi.kt

@@ -58,7 +58,7 @@ open class KtUltraLightClass(classOrObject: KtClassOrObject, internal val suppor
         // This property may be removed once IntelliJ versions earlier than 2018.3 become unsupported
         // And usages of that property may be replaced with relevant registry key
         @Volatile
-        @TestOnly
+        @get:TestOnly
         var forceUsingUltraLightClasses = false
     }
 

compiler/light-classes/src/org/jetbrains/kotlin/asJava/elements/lightAnnotations.kt

@@ -408,7 +408,7 @@ private fun getAnnotationName(callee: KtExpression): String? {
     return null
 }
 
-@TestOnly
+@get:TestOnly
 var accessAnnotationsClsDelegateIsAllowed = false
 
 @TestOnly