Fix execution examples, run fmte

[Weilando]

Changes

We fix broken examples with old command or statement execution calls. In addition, we run make fmte.

Closes #341
Closes #267

Tests

We have fixed function calls in the examples. Therefore, production code is not affected.

• make test run locally
• make fmt applied (also make fmte)
• relevant integration tests applied

[mgyucht]

@Weilando thank you for contributing this. FYI: only the top-level examples are maintained by hand; the rest are autogenerated, so your changes will be overwritten by the next autogeneration run. We need to fix those examples separately. Can you remove the changes to autogenerated examples?

Also, please make sure your commits are signed, otherwise we can't merge them.

[Weilando]

Thanks for the hint, @mgyucht! So we only need to change examples/flask_app_with_oauth.py and examples/starting_job_and_waiting.py manually, correct? How do we update the autogenerated examples?

Sorry, I was not aware of signed commits so far and will make sure to set it up accordingly.