refactor jupyterhub user token retrieval within pytest

[viniciusdc]

Reference Issues or PRs

closes #2643
closes #2641

What does this implement/fix?

• Includes two new parameters to paramiko ssh client to resolve issues with authentication keys when running tests locally;
• Include CookieConflictError exception to handle duplicate cookies entries during jupyterhub authentication;
• Add a new function to generate new jupyterhub user access tokens using the previous one; this reduces the requirement to simulate the whole user authentication workflow only once. Thus, we rely solely on jupytehrub API for all subsequent token requests.
• Include a fixture/decorator to speed up new token generation for each test

Put a x in the boxes that apply

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds a feature)
• Breaking change (fix or feature that would cause existing features not to work as expected)
• Documentation Update
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Build related changes
• Other (please describe):

Testing

• Did you test the pull request locally?
• Did you add new tests?

Any other comments?

[viniciusdc]

pytests are passing, playwright-related tests should be fixed by #2644, though I expect this PR to be merged first

tests/tests_deployment/test_jupyterhub_ssh.py::test_simple_jupyterhub_ssh 
-------------------------------- live log setup --------------------------------
2024-08-28 01:47:28      INFO 1923 transport: Connected (version 2.0, client AsyncSSH_2.13.2)
2024-08-28 01:47:28      INFO 1923 transport: Auth banner: b'Starting your server...'
2024-08-28 01:47:29      INFO 1923 transport: Auth banner: b'.'
...
2024-08-28 01:47:36      INFO 1923 transport: Auth banner: b'.'
2024-08-28 01:47:[37](https://github.com/nebari-dev/nebari/actions/runs/10588577627/job/29341302387?pr=2645#step:16:38)      INFO 1923 transport: Auth banner: b'.'
...
2024-08-28 01:47:47      INFO 1923 transport: Auth banner: b'.'
2024-08-28 01:47:47      INFO 1923 transport: Auth banner: b'done!\n'
2024-08-28 01:47:47      INFO 1923 transport: Authentication (password) successful!
PASSED
tests/tests_deployment/test_jupyterhub_ssh.py::test_print_jupyterhub_ssh 
-------------------------------- live log setup --------------------------------
2024-08-28 01:47:47      INFO 1923 transport: Connected (version 2.0, client AsyncSSH_2.13.2)
2024-08-28 01:47:47      INFO 1923 transport: Authentication (password) successful!

and

tests/tests_deployment/test_grafana_api.py::test_grafana_api_not_accessible_with_default_credentials PASSED
tests/tests_deployment/test_jupyterhub_api.py::test_jupyterhub_loads_roles_from_keycloak PASSED
tests/tests_deployment/test_jupyterhub_api.py::test_default_user_role_scopes[get-default-scopes] PASSED
tests/tests_deployment/test_jupyterhub_api.py::test_check_default_roles_added_in_keycloak PASSED
tests/tests_deployment/test_jupyterhub_api.py::test_keycloak_roles_attributes_parsed_as_jhub_scopes[jupyterhub-read:users:shares,read:groups:shares,users:shares-expected_scopes_difference0-before-role-creation-and-assignment] PASSED
tests/tests_deployment/test_jupyterhub_api.py::test_keycloak_roles_attributes_parsed_as_jhub_scopes[invalid-component-read:users:shares,read:groups:shares,users:shares-expected_scopes_difference1-before-role-creation-and-assignment] PASSED
tests/tests_deployment/test_jupyterhub_api.py::test_keycloak_roles_attributes_parsed_as_jhub_scopes[invalid-component-admin:invalid-scope-expected_scopes_difference2-before-role-creation-and-assignment] PASSED
tests/tests_deployment/test_jupyterhub_api.py::test_jupyterhub_loads_groups_from_keycloak PASSED

[marcelovilla]

Thanks @viniciusdc !

[viniciusdc]

blocked by #2672