Add a warning for name shadowing case with Enum.entries

^KT-53153

compiler/testData/diagnostics/tests/enum/entries/nameShadowingOfExternallyDefinedEntries.fir.kt

@@ -0,0 +1,39 @@
+// !LANGUAGE: -EnumEntries
+
+package pckg
+
+val entries = "E"
+
+enum class E {
+    ;
+
+    fun foo() {
+        entries
+        pckg.entries
+    }
+}
+
+class A {
+    enum class E {
+        ;
+
+        class B {
+            fun foo() {
+                entries
+                pckg.entries
+            }
+        }
+
+        class C {
+            val entries = 0
+
+            fun foo() {
+                // technically, this warning is incorrect but I believe it's OK to report anyway
+                // first, logic in the compiler will be complicated if we'll try to avoid reporting warnings here
+                // second, this code smells,  it'd be better to use qualifiers here anyway
+                entries
+                this.entries
+            }
+        }
+    }
+}