Weekly reports may be rendering transaction data incorrectly

### Environment

SaaS (https://sentry.io/)

### Steps to Reproduce

Enable weekly reports for your Organization.

### Expected Result

All stats in the weekly report match the stats shown in the organization settings?

### Actual Result

Firstly, the weekly report tracks transactions while the Sentry organization tracks spans. Secondly, there are dropped transactions in the weekly report, however, there are no dropped spans in the org's stats.

Relevant links: [Slack](https://sentry.slack.com/archives/C06J6HKFKLG/p1758011360059939), [Linear](https://linear.app/getsentry/issue/RTC-1207/weekly-reports-may-be-rendering-transaction-data-incorrectly), [Zendesk](https://sentry.zendesk.com/agent/tickets/162200)

### Product Area

Stats

### Link

_No response_

### DSN

_No response_

### Version

_No response_

Start by enabling weekly reports for an organization and comparing their statistics with the organization settings. Review the linked Linear issue, Slack discussion, and Zendesk ticket for context on the transaction-versus-span discrepancy and dropped data. Done means the weekly report matches the organization statistics without unexplained dropped data.

Written by the indexing model from the issue text.