[noTicket][risk=no]Rename cron job check free tier billing usage

[NehaBroad]

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[jmthibault79]

Looks good - but there is also a script in api/tools/src/cron. Is there a PR to update the alerts as well?

[yonghaoy]

LG. And it will also bring cron alert back https://github.com/all-of-us/workbench-terraform-modules/blob/e39543b7662fe98634b64cb1eab0b1e3c09124f7/modules/workbench/modules/monitoring/modules/alert_policies/assets/alert_policies/cron_failure_free_tier_billing_usage.json#L6

[NehaBroad]

@yonghaoy:
PR to make changes for terra form all-of-us/workbench-terraform-modules#58
That PR will be pushed once this is release