SG-35018 Condition auth for Jenkins environment

[carlos-villavicencio-adsk]

Checklist

• Use login/password for authentication when running on SG_JENKINS.
• Unskip and fix old tests
• Skip datetime tests on Jenkins (they also fail locally)
• Refactor helper method to reduce sleep time in e861767

Centralized authentication

Now all tests use the same authentication credentials. By default, it uses and expects a script name/key pair provided on the config file. However, a special flag SG_JENKINS is considered to use username/password only for SG sites that haven't created a script.

Improved test time

Before	After

Test durations

Argument durations was added to pytest to detect the slowest tests and improve them in the future

How to reproduce Jenkins environment locally:

Step 1: remove script_name/api_key from config file

Step 2: add human_login / human_password to config file

Step 3: run

export SG_JENKINS=1
pytest tests/test_api.py

[julien-lang]

Looks good. Only a few minor comments.