Update Grafana test-values.yaml

Re-evaluate the current test-values.yaml in Big bang

Check for duplicate configurations that are already configured within the values itself and remove them. Add additional testing if needed.

URL: https://repo1.dso.mil/big-bang/product/packages/grafana

Default Values URL: https://repo1.dso.mil/big-bang/product/packages/grafana/-/raw/main/chart/values.yaml

BB Test Values URL: https://repo1.dso.mil/big-bang/bigbang/-/raw/master/tests/test-values.yaml

Duplicates found in grafana for BB Test Values:
bbtests.cypress.artifacts  =  true
downloadDashboards.resources.limits.cpu  =  20m
downloadDashboards.resources.limits.memory  =  20Mi
downloadDashboards.resources.requests.cpu  =  20m
downloadDashboards.resources.requests.memory  =  20Mi