AWS Billing Alerts Optimization

**Describe the Issue**
Problem: Billing alerts in AWS are not ideal in the form, not clear from the first look and also sometimes will be sent all at once if the budget is reached too quickly, or set under current spend.
**Additional Context**
This ticket is to describe the problem and can evolve into solutions as we refine them
**Acceptance Criteria**
Potential solutions:

- [ ] Create our own email alerts and disable AWS spend alerts
- [ ] Add a point to discuss during onboarding about billing alerts

No files, tests, or entry points are named. Start by reviewing the current AWS billing and spend-alert configuration, then compare the proposed email-alert and onboarding approaches. Done requires agreeing on a solution and updating the billing-alert process so alerts are clear and useful.

Written by the indexing model from the issue text.