The Fineract tenants and tenant database names by default are currently mifosplatform-tenants and mifostenant-default respectively.
The Google Cloud Platform console for managed MySQL (Cloud SQL) prevents creating MySQL databases containing dashes; the UI says Database name: Needs to follow the MySQL identifier rules.
While this limitation appears to only be enforced in the Google Cloud UI (it's still possible to create databases containing '-' dashes using the gcloud CLI), the linked doc does seem to suggest to use only underscores.
To make this simpler, and comply with mySQL doc recommendation, let's change mifosplatform-tenants to fineract_tenants and mifostenant-default to fineract_default. (The change from mifosplatform to fineract is just because this seems a good opportunity to make that change, and because it's probably less and not more confusing to change the entire name, and not just a dash to and underscore.)