[FEATURE REQUEST] Mark slow tests in Pytest

[xingjian-zhang]

Is your feature request related to a problem? Please describe.
Running all tests on GitHub may take too much time.

Describe the solution you'd like
We want a flexible solution that allows testing different sets of datasets by need. In particular, we want to mark some datasets as slow using pytest.

Describe alternatives you've considered
#257

Additional context

• Original discussion: [FEATURE REQUEST] Trigger tests by changes in /glb/ #225
• Related pytest doc: https://docs.pytest.org/en/7.1.x/example/markers.html#marking-individual-tests-when-using-parametrize

[xingjian-zhang]

Hi, @StevenGolden1203. Could you please take a look at this feature request when you are available?