Allow sourcing disabled components (#7215)

Check `component_names` instead of `pipe_names` to allow sourcing
disabled components.

spacy/language.py

@@ -684,12 +684,12 @@ class Language:
         # TODO: handle errors and mismatches (vectors etc.)
         if not isinstance(source, self.__class__):
             raise ValueError(Errors.E945.format(name=source_name, source=type(source)))
-        if not source.has_pipe(source_name):
+        if not source_name in source.component_names:
             raise KeyError(
                 Errors.E944.format(
                     name=source_name,
                     model=f"{source.meta['lang']}_{source.meta['name']}",
-                    opts=", ".join(source.pipe_names),
+                    opts=", ".join(source.component_names),
                 )
             )
         pipe = source.get_pipe(source_name)