Re-evaluate test-values.yaml

Re-evaluate the current test-values.yaml in both Big bang and within the package

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/promtail

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

Package Test Values URL: https://repo1.dso.mil/big-bang/product/packages/promtail/-/raw/main/tests/test-values.yaml

Duplicates found in promtail for Package Test Values:
imagePullSecrets.0.name  =  private-registry