Provide more clear API around AnnotationChecker.applicableTargetSet

compiler/frontend.java/src/org/jetbrains/kotlin/resolve/jvm/checkers/FileClassAnnotationsChecker.kt

@@ -50,7 +50,7 @@ object FileClassAnnotationsChecker : AdditionalAnnotationChecker {
             val descriptor = trace.get(BindingContext.ANNOTATION, entry) ?: continue
             val classDescriptor = descriptor.annotationClass ?: continue
             // This check matters for the applicable annotations only.
-            val applicableTargets = AnnotationChecker.applicableTargetSet(classDescriptor)
+            val applicableTargets = AnnotationChecker.applicableTargetSetFromTargetAnnotationOrNull(classDescriptor)
             if (applicableTargets == null || !applicableTargets.contains(KotlinTarget.FILE)) continue
             fileAnnotationsToCheck.add(Pair(entry, classDescriptor))
         }

compiler/frontend.java/src/org/jetbrains/kotlin/resolve/jvm/checkers/RepeatableAnnotationChecker.kt

@@ -205,8 +205,8 @@ class RepeatableAnnotationChecker(
         annotationClass: ClassDescriptor,
         reportOn: KtAnnotationEntry,
     ): Diagnostic? {
-        val annotationTargets = AnnotationChecker.applicableTargetSet(annotationClass) ?: KotlinTarget.DEFAULT_TARGET_SET
-        val containerTargets = AnnotationChecker.applicableTargetSet(containerClass) ?: KotlinTarget.DEFAULT_TARGET_SET
+        val annotationTargets = AnnotationChecker.applicableTargetSet(annotationClass)
+        val containerTargets = AnnotationChecker.applicableTargetSet(containerClass)
 
         // See https://docs.oracle.com/javase/specs/jls/se16/html/jls-9.html#jls-9.6.3.
         // (TBH, the rules about TYPE/TYPE_USE and TYPE_PARAMETER/TYPE_USE don't seem to make a lot of sense, but it's JLS