Change Grafana login to built-in gluon method.
General MR
Summary
For some reason, now that we are able to see artifacts in the umbrella pipeline for bbctl, the issue with the tests is now the login page. Changing the handbuilt login in this test to the gluon built in cypress command which seems to be working for loki, kyverno, grafana, and alloy tests to make this more stable.
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Edited by Blair Bowden