[Analysis API] Allow disabling sealed class inheritor searcher in tests

Index-less implementation of sealed class inheritor searcher affects
Java caches, making laziness work quite differently, comparing to IDEs.

analysis/analysis-api-standalone/tests/org/jetbrains/kotlin/analysis/api/standalone/fir/test/StandaloneModeConfigurator.kt

@@ -24,6 +24,7 @@ object StandaloneModeConfigurator : AnalysisApiTestConfigurator() {
 
     override fun configureTest(builder: TestConfigurationBuilder, disposable: Disposable) {
         with(builder) {
+            useDirectives(SealedClassesInheritorsCaclulatorPreAnalysisHandler.Directives)
             usePreAnalysisHandlers(::SealedClassesInheritorsCaclulatorPreAnalysisHandler)
         }
     }