[IFT] Do not allow opening reworked onboarding tour until indexing is finished

Move properties override to project-based onboarding lesson base class.
Probably will make the problems described in IFT-591 and IFT-592 appear less often.

GitOrigin-RevId: fa8ad0874ba30ef3b38fb719ef3fcc7a27159fa7

java/java-features-trainer/src/com/intellij/java/ift/lesson/essential/CommonLogicForOnboardingTours.kt

@@ -76,11 +76,6 @@ abstract class CommonLogicForOnboardingTours(id: String, @Nls lessonName: String
   @NlsSafe
   private var jdkAtStart: String = "undefined"
 
-  override val properties: LessonProperties = LessonProperties(
-    canStartInDumbMode = true,
-    openFileAtStart = false
-  )
-
   override val testScriptProperties: TaskTestContext.TestScriptProperties = TaskTestContext.TestScriptProperties(skipTesting = true)
 
   open fun TaskRuntimeContext.rememberJdkAtStart() {

java/java-features-trainer/src/com/intellij/java/ift/lesson/essential/OnboardingTourLessonBase.kt

@@ -17,6 +17,7 @@ import training.dsl.*
 import training.dsl.LessonUtil.restoreIfModified
 import training.learn.LearnBundle
 import training.learn.NewUsersOnboardingExperimentAccessor
+import training.learn.course.LessonProperties
 import training.learn.course.LessonType
 import training.learn.lesson.general.run.clearBreakpoints
 import training.project.ProjectUtils
@@ -29,6 +30,11 @@ import javax.swing.tree.TreePath
 abstract class OnboardingTourLessonBase(id: String) : CommonLogicForOnboardingTours(id, JavaLessonsBundle.message("java.onboarding.lesson.name")) {
   override val lessonType: LessonType = LessonType.PROJECT
 
+  override val properties: LessonProperties = LessonProperties(
+    canStartInDumbMode = true,
+    openFileAtStart = false
+  )
+
   private lateinit var openLearnTaskId: TaskContext.TaskId
 
   private val demoFileDirectory: String = "src"