Can't load trace with 220K+ Spans

### Environment

SaaS (https://sentry.io/)

### Steps to Reproduce

1. Go to trace details view (trace waterfall) for a trace with 220k+ spans (exact number needed to reproduce issue unknown)

### Expected Result

Trace loads, perhaps with some loading time

### Actual Result

A gateway timeout is hit, Sentry reties 3 times and eventually fails

### Product Area

Unknown

### Link

_No response_

### DSN

_No response_

### Version

_No response_

Start at the trace details view and trace waterfall for a trace with 220k+ spans, using the reproduction steps in the issue. Investigate the gateway timeout and three retries reported by Sentry. Done means the trace loads successfully, or the issue documents a confirmed supported limit and an appropriate handling path.

Written by the indexing model from the issue text.