plots: Rename template_path to html_template.

dvc/commands/plots.py

@@ -150,7 +150,7 @@ class CmdPlots(CmdBase):
                 render_html(
                     renderers=renderers,
                     output_file=output_file,
-                    template_path=self._html_template_path(),
+                    html_template=self._html_template_path(),
                 )
 
                 ui.write(output_file.as_uri())

tests/unit/command/test_plots.py

@@ -285,7 +285,7 @@ def test_should_call_render(tmp_dir, mocker, capsys, plots_data, output):
     render_mock.assert_called_once_with(
         renderers=renderers,
         output_file=Path(tmp_dir / output / "index.html"),
-        template_path=None,
+        html_template=None,
     )