fix(rulesets): exclude non-schema enum properties from duplicated-entry-in-enum rule (#2934)

* fix(rulesets): exclude non-schema enum properties from duplicated-entry-in-enum rule

The duplicated-entry-in-enum rule was incorrectly firing on properties named 'enum' in contexts like discriminator mappings and example values, where 'enum' is a data field rather than a JSON Schema keyword.

Narrow the JSONPath filter to only match when the 'enum' value is actually an array, which is the only valid form for a schema enum keyword.

Fixes #2199

* chore: restore generated Arazzo validators bundle

---------

Co-authored-by: Sebastian Legarraga <slegarraga@users.noreply.github.com>
Co-authored-by: tomek-tursa-sb <100731230+tomek-tursa-sb@users.noreply.github.com>

Author: slegarraga

packages/rulesets/src/oas/__tests__/duplicated-entry-in-enum.test.ts

@@ -105,4 +105,57 @@ testRule('duplicated-entry-in-enum', [
       },
     ],
   },
+
+  {
+    name: 'oas3: enum as discriminator mapping key',
+    document: {
+      openapi: '3.0.2',
+      components: {
+        schemas: {
+          Pet: {
+            type: 'object',
+            discriminator: {
+              propertyName: 'petType',
+              mapping: {
+                enum: '#/components/schemas/Cat',
+              },
+            },
+          },
+        },
+      },
+    },
+    errors: [],
+  },
+
+  {
+    name: 'oas3: enum as example value property',
+    document: {
+      openapi: '3.0.2',
+      paths: {
+        '/test': {
+          get: {
+            responses: {
+              '200': {
+                description: 'ok',
+                content: {
+                  'application/json': {
+                    examples: {
+                      sample: {
+                        value: {
+                          foo: {
+                            enum: 'someString',
+                          },
+                        },
+                      },
+                    },
+                  },
+                },
+              },
+            },
+          },
+        },
+      },
+    },
+    errors: [],
+  },
 ]);

packages/rulesets/src/oas/index.ts

@@ -159,7 +159,7 @@ const ruleset = {
       severity: 'warn',
       recommended: true,
       message: '{{error}}',
-      given: ["$..[?(@property !== 'properties' && @ && @.enum)]"],
+      given: ["$..[?(@property !== 'properties' && @.enum && @.enum.constructor.name === 'Array')]"],
       then: {
         field: 'enum',
         function: oasSchema,