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/javaEnumEntriesAmbiguityOn.kt

@@ -0,0 +1,34 @@
+// !LANGUAGE: +EnumEntries
+// WITH_STDLIB
+// FIR_DUMP
+
+// FILE: JEnumEntry.java
+
+public enum JEnumEntry {
+    entries;
+}
+
+// FILE: JEnumStaticField.java
+
+public enum JEnumStaticField {
+    ;
+
+    public static final int entries = 0;
+}
+
+// FILE: JEnumField.java
+
+public enum JEnumField {
+    ;
+
+    public final int entries = 0;
+}
+
+// FILE: test.kt
+
+fun test() {
+    JEnumEntry.entries
+    JEnumStaticField.entries
+
+    JEnumField::<!DEPRECATED_ACCESS_TO_ENUM_ENTRY_PROPERTY_AS_REFERENCE!>entries<!>
+}