Removed Credential Auto-Deactivation

Previously, when all accounts under a credential were deactivated, Arcadia would automatically deactivate the credential as a convenience feature. However, some users rightfully pointed out that by deactivating a credential, they lose the ability to have new accounts discovered under the credential in cases where they'd prefer to also have all existing accounts under the credential deactivated.

After considering this feedback, we decided to remove the auto-deactivation of credentials feature. Any users that wish to deactivate a credential must explicitly do so rather than depending on the deactivation of all accounts associated with it. The reverse behavior, where all accounts and meters under a credential are deactivated if the credential is deactivated, is still in place.