Run pytest again on CI

[tobiasdiez]

Pytest used to run on CI, but this is no longer the case. Here, we reactivate it by removing some safe-guards that are no longer necessary as pytest is a standard package now.

📝 Checklist

• The title is concise and informative.
• The description explains in detail what this PR is about.
• I have linked a relevant issue or discussion.
• I have created tests covering the changes.
• I have updated the documentation and checked the documentation preview.

⌛ Dependencies

[tobiasdiez]

No idea about the failing tests in test-long....

[orlitzky]

I guess the CI is invoking pytest via the ./sage script and a doctest wrapper? I was just typing pytest like a crazy person.

[tobiasdiez]

I guess the CI is invoking pytest via the ./sage script and a doctest wrapper? I was just typing pytest like a crazy person.

Yes, pytest is called as part of sage -t (that was supposed to work already). I don't get the test failures in dev_tools.py - they seem to be unrelated.