Remove new tags for now

This will probably need to be re-added, but the goal is to keep
this PR focused on updating the format of the tags rather than the
content. We probably need to give some more thought to how tags
should be inherited to reduce duplication between estimators as well.

src/sknnr/_gnn.py

@@ -68,10 +68,3 @@ class GNNRegressor(YFitMixin, OrdinationKNeighborsRegressor):
 
     def _get_transformer(self) -> TransformerMixin:
         return CCATransformer(self.n_components)
-
-    def __sklearn_tags__(self):
-        tags = super().__sklearn_tags__()
-        tags.target_tags.single_output = False
-        tags.target_tags.two_d_labels = True
-
-        return tags

src/sknnr/transformers/_cca_transformer.py

@@ -47,7 +47,5 @@ def fit_transform(self, X, y):
     def __sklearn_tags__(self):
         tags = super().__sklearn_tags__()
         tags.target_tags.required = True
-        tags.target_tags.single_output = False
-        tags.target_tags.two_d_labels = True
 
         return tags