Usage metering and Console onboarding fixes#

Organizations with overages off now stop at their included allowance, organization creation during onboarding reliably activates and continues, and document updates count only newly added content.

Fixes

Organizations with overages off now stop at their included allowance instead of recording billable usage.
Creating an organization during Console onboarding now reliably activates it and continues setup.
Updating a document now counts only newly added content instead of re-counting unchanged text.