[bug] Fix flacky checks in qhub/deploy.py

[costrouc]

Describe the bug

The CI is still occasionally failing when waiting for services to come up. Lets adjust the checks to run for a total of 1 minute.

Expected behaviour

No unexpected failing tests

Actual behaviour

Don't have enough prs to get a good idea of the failure rate but we have seen 1 so far.

• https://github.com/Quansight/qhub/runs/5055664161?check_suite_focus=true

How to reproduce

[viniciusdc]

The issue might be related to getting keycloak-server pod in a running state... we can also easily add a null_resource to wait a certain amount of time right after the helm resource is deployed. But I am not sure if that would be sufficient