[FIR] Add enum entry to body resolve context containers

This fixes processing of annotations on enum entries.
Before, the check in BodyResolveContext.forAnnotation would set the
tower data mode to CLASS_HEADER_ANNOTATIONS because no containers were
present.
This would lead to some tower data elements like nested classifiers
missing, which would lead to false positive unresolved references.

#KT-63761 Fixed

compiler/testData/diagnostics/tests/annotations/nestedClassAsAnnotationParameter.kt

@@ -1,12 +1,38 @@
 // FIR_IDENTICAL
 import kotlin.reflect.KClass
 
-@Target(AnnotationTarget.CLASS, AnnotationTarget.TYPE_PARAMETER, AnnotationTarget.TYPE)
+@Target(
+    AnnotationTarget.CLASS,
+    AnnotationTarget.TYPE_PARAMETER,
+    AnnotationTarget.TYPE,
+    AnnotationTarget.PROPERTY,
+    AnnotationTarget.FUNCTION,
+    AnnotationTarget.CONSTRUCTOR
+)
 annotation class Special(val why: KClass<*>)
 
 interface Interface
 
-class Outer {
+class Outer @Special(Nested::class) constructor(
+    @Special(Nested::class)
+    val why: KClass<*>
+) {
     @Special(Nested::class)
     class Nested<@Special(Nested::class) T> : @Special(Nested::class) Interface
+
+    @Special(Nested::class)
+    val why2: KClass<*>? = null
+
+    @Special(Nested::class)
+    fun why3() {}
 }
+
+enum class E(
+    @Special(Nested::class)
+    val why: KClass<*>
+) {
+    @Special(Nested::class)
+    Foo(Nested::class);
+
+    class Nested
+}