Resolve Cypress Test Failures (Istio Dashboard Check)

Recently the istio dashboard check has been consistently failing. Not sure if this is due to updates of the dashboard or if there is something else going wrong but it definitely appears to be a testing issue since all dashboards look OK.

Example failure: https://repo1.dso.mil/platform-one/big-bang/bigbang/-/jobs/9985059

AC:

• Test updated to consistently pass but still catch true failures