`with_dict` type error include value in error message (#84473)

* with_dict better error message

* include type in error message

* changelog fragment

* Update lib/ansible/plugins/lookup/dict.py

Co-authored-by: Abhijeet Kasurde <akasurde@redhat.com>

* specific wording

---------

Co-authored-by: Abhijeet Kasurde <akasurde@redhat.com>

changelogs/fragments/84473-dict-lookup-type-error-message.yml

@@ -0,0 +1,2 @@
+minor_changes:
+  - when the ``dict`` lookup is given a non-dict argument, show the value of the argument and its type in the error message.

lib/ansible/plugins/lookup/dict.py

@@ -70,7 +70,7 @@ class LookupModule(LookupBase):
         for term in terms:
             # Expect any type of Mapping, notably hostvars
             if not isinstance(term, Mapping):
-                raise AnsibleError("with_dict expects a dict")
+                raise AnsibleError(f"the 'dict' lookup plugin expects a dictionary, got '{term}' of type {type(term)})")
 
             results.extend(self._flatten_hash_to_list(term))
         return results