[CI] Add pytest markers in config files. (#719)

Signed-off-by: Alicia <115451386+congw729@users.noreply.github.com>

docs/contributing/model/adding_diffusion_model.md

@@ -140,7 +140,7 @@ Key point for writing the example:
 + Save or display the generated results so users can validate the integration.
 
 # Testing
-For comprehensive testing guidelines, please refer to the [Test File Structure and Style Guide](../tests/tests_style.md).
+For comprehensive testing guidelines, please refer to the [Test File Structure and Style Guide](../ci/tests_style.md).
 
 
 ## Adding a Model Recipe