feat(httpx): Migrate to span first #6084

Bugbot Review

Bugbot Analysis Progress (5m 3s elapsed)

✅ Gathered PR context (3s)
✅ Completed bug detection (4m 56s)
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Final Result: Bugbot completed review and found 2 potential issues.

Request ID: serverGenReqId_116bc0a0-35aa-409c-8480-e48ca101e162

Cursor Bugbot has reviewed your changes and found 2 potential issues.

^{❌ Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, enable autofix in the Cursor dashboard.}

^{Reviewed by Cursor Bugbot for commit 25a953e. Configure here.}