[Flaky CI]: Cloudflare Integration Tests - suites/public-api/startSpan-streamed/test.ts > sends a streamed span envelope with correct spans for a manually started span with children

### Flakiness Type

Other / Unknown

### Name of Job

Cloudflare Integration Tests

### Name of Test

suites/public-api/startSpan-streamed/test.ts > sends a streamed span envelope with correct spans for a manually started span with children

### Link to Test Run

https://github.com/getsentry/sentry-javascript/actions/runs/35069804130/job/104709032617

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_This issue was automatically created._

Start with suites/public-api/startSpan-streamed/test.ts and the linked Cloudflare Integration Tests run to identify why this test is flaky. Reproduce or inspect the reported failure, then verify the test consistently sends a streamed span envelope with the correct spans for the manually started span and its children.

索引モデルが issue の本文から書いたものです。