tests: add failing test case for recursive callback reference

test_specs/advancecallbackreferences/min-callbacks.yaml

@@ -0,0 +1,3 @@
+test-callback:
+  "/test-callback":
+    $ref: "./min-components.yaml#/components/pathItems/test-callback"

test_specs/advancecallbackreferences/min-components.yaml

@@ -0,0 +1,9 @@
+components:
+  pathItems:
+    test-callback:
+      $ref: "#/components/pathItems/test-callback-2"
+    test-callback-2:
+      get:
+        responses:
+          "200":
+            description: OK

test_specs/advancecallbackreferences/min-openapi.yaml

@@ -0,0 +1,16 @@
+openapi: 3.1.0
+info:
+  title: Test
+  version: 0.0.1
+servers:
+  - url: https://test.com
+paths:
+  /test:
+    get:
+      operationId: test
+      responses:
+        "200":
+          description: OK
+      callbacks:
+        test:
+          $ref: "./min-callbacks.yaml#/test-callback"