fix(billing): recover org stripe bootstrap when reload misses

[posthog-eu]

Summary

• Problem: a new org could finish signup with no Stripe customer, no stripe_info trial row, and no trial plan. createStripeCustomer re-selected the org row and threw createStripeCustomer org reload failed when the committed row was not yet visible, which aborted the whole billing bootstrap for that org.
• The only caller (on_organization_create) already reloads that row and deliberately falls back to the INSERT queue payload, so the helper's re-select made that fallback dead code — it re-ran the same query and threw anyway.
• Fix: the reload guard now returns null instead of throwing, and createStripeCustomer reuses the org row the caller passed when the reload misses. A stale read no longer aborts provisioning.
• The race-recovery exception now carries the org id and the underlying Supabase error in its message (error tracking keeps only the message), so a future failure shows which org failed and why.

Test plan

• bun test:unit — updated tests/stripe-org-customer.unit.test.ts: the reload-miss case now asserts recovery (customer created, plan returned, link uses the passed row) instead of a throw.
• bun run typecheck:backend and bun run lint:backend pass.

Screenshots

Checklist

• My code follows the code style of this project and passes
  bun run lint:backend && bun run lint.
• My change requires a change to the documentation.
• I have updated the documentation
  accordingly.
• My change has adequate E2E test coverage.
• I have tested my code manually, and I have provided steps how to reproduce
  my tests

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[codspeed]

Merging this PR will not alter performance

✅ 43 untouched benchmarks
⏩ 2 skipped benchmarks¹

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_{Comparing posthog-self-driving/fixbilling-stop-org-create-stripe-525cbb (f67c0af) with main (c7d419f)}

Footnotes

1. 2 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud