Utilize global pull policy for Kyverno and Vault

Merge Request

Changes

Update Kyverno and Vault to use the global image pull policy. Also document the overrides.

For Issue

Closes https://repo1.dso.mil/platform-one/big-bang/bigbang/-/issues/979

Closes https://repo1.dso.mil/platform-one/big-bang/bigbang/-/issues/954