add info about plugin name when ignoring abstract errors (#78465)

* add info about plugin name when ignoring abstract

  related to #78464

* added error to narrow down method

changelogs/fragments/abstract_errors_info.yml

@@ -0,0 +1,3 @@
+bugfixes:
+  - plugin loader, now when skipping a plugin due to an abstract method error we provide that in 'verbose' mode instead of totally obscuring the error.
+    The current implementation assumed only the base classes would trigger this and failed to consider 'in development' plugins.

lib/ansible/plugins/loader.py

@@ -873,8 +873,8 @@ class PluginLoader:
                 obj = instance
             except TypeError as e:
                 if "abstract" in e.args[0]:
-                    # Abstract Base Class.  The found plugin file does not
-                    # fully implement the defined interface.
+                    # Abstract Base Class or incomplete plugin, don't load
+                    display.v('Returning not found on "%s" as it has unimplemented abstract methods; %s' % (name, to_native(e)))
                     return get_with_context_result(None, plugin_load_context)
                 raise