fix(changed): Fix change detection temporarily

Fix the change detection of kubernetes.core temporarily by monkey
patching the service.diff_objects function. This fix should be removed
once it was merged into kubernetes.core. A dummy _patch_diff_objects
function is introduced to satisfy ansible linters.

Signed-off-by: Felix Matouschek <fmatouschek@redhat.com>

plugins/module_utils/diff.py

@@ -0,0 +1,43 @@
+# -*- coding: utf-8 -*-
+# Copyright 2025 Red Hat, Inc.
+# Apache License 2.0 (see LICENSE or http://www.apache.org/licenses/LICENSE-2.0)
+
+from typing import Dict, Tuple, Optional
+
+from ansible_collections.kubernetes.core.plugins.module_utils.k8s import service
+
+
+# Copied from
+# https://github.com/ansible-collections/kubernetes.core/blob/d329e7ee42799ae9d86b54cf2c7dfc8059103504/plugins/module_utils/k8s/service.py#L493
+# Removed this once this fix was merged into kubernetes.core.
+def _diff_objects(
+    existing: Dict, new: Dict, hidden_fields: Optional[list] = None
+) -> Tuple[bool, Dict]:
+    result = {}
+    diff = service.recursive_diff(existing, new)
+    if not diff:
+        return True, result
+
+    result["before"] = service.hide_fields(diff[0], hidden_fields)
+    result["after"] = service.hide_fields(diff[1], hidden_fields)
+
+    if list(result["after"].keys()) == ["metadata"] and list(
+        result["before"].keys()
+    ) == ["metadata"]:
+        # If only metadata.generation and metadata.resourceVersion changed, ignore it
+        ignored_keys = set(["generation", "resourceVersion"])
+
+        if set(result["after"]["metadata"].keys()).issubset(ignored_keys) and set(
+            result["before"]["metadata"].keys()
+        ).issubset(ignored_keys):
+            return True, result
+
+    return False, result
+
+
+service.diff_objects = _diff_objects
+
+
+def _patch_diff_objects():
+    """_dummy is required to satisfy the unused import linter and the ansible-doc sanity check."""
+    pass