filter/test plugin listing, fix bug on file sorting (#79591)

* filter/test plugin listing, fix bug on file sorting

avoid legacy/builtin special casing for 'all'

changelogs/fragments/adoc_fix_list.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - ansible-doc now will correctly display short descriptions on listing filters/tests no matter the directory sorting.

lib/ansible/plugins/list.py

@@ -112,10 +112,7 @@ def _list_plugins_from_paths(ptype, dirs, collection, depth=0):
 def _list_j2_plugins_from_file(collection, plugin_path, ptype, plugin_name):
 
     ploader = getattr(loader, '{0}_loader'.format(ptype))
-    if collection in ('ansible.builtin', 'ansible.legacy'):
-        file_plugins = ploader.all()
-    else:
-        file_plugins = ploader.get_contained_plugins(collection, plugin_path, plugin_name)
+    file_plugins = ploader.get_contained_plugins(collection, plugin_path, plugin_name)
     return file_plugins