K2: reproduce KT-57954 and reorganize tests around enum entries warnings

In particular, here we add FIR_DUMP to all enum entries tests with
some deprecation diagnostics and the feature on, and remove all txt-files

compiler/testData/diagnostics/tests/enum/entries/conflictingPropertyEntriesAndReferenceOn.kt

@@ -0,0 +1,16 @@
+// !LANGUAGE: +EnumEntries
+// WITH_STDLIB
+// FIR_DUMP
+
+enum class E {
+    ;
+
+    val entries: Int = 0
+}
+
+fun test() {
+    E::<!DEPRECATED_ACCESS_TO_ENUM_ENTRY_PROPERTY_AS_REFERENCE!>entries<!>
+    val ref = E::<!DEPRECATED_ACCESS_TO_ENUM_ENTRY_PROPERTY_AS_REFERENCE!>entries<!>
+    val refType: (E) -> Int = E::entries
+    val refTypeWithAnyExpectedType: Any = E::<!DEPRECATED_ACCESS_TO_ENUM_ENTRY_PROPERTY_AS_REFERENCE!>entries<!>
+}