fix(database): set priority on child snapshot if available

[russellwheatley]

Description

Related issues

fixes: #7719

Release Summary

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
  • Yes
• My change supports the following platforms;
  • Android
  • iOS
• My change includes tests;
  • e2e tests added or updated in packages/\*\*/e2e
  • jest tests added or updated in packages/\*\*/__tests__
• I have updated TypeScript types that are affected by my change.
• This is a breaking change;
  • Yes
  • No

Test Plan

---

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Name	Status	Preview	Comments	Updated (UTC)
react-native-firebase	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 15, 2024 11:19am

[mikehardy]

CI is not executing all the tests all the time as noted on slack, that's a pretty serious problem as false-positives on the testing are dangerous. I noticed it on this PR since the codecov bot annotated lines as uncovered when a test clearly covered them.

Local testing is passing but we need to find the root cause of CI not executing all tests

        ✔ it should create js apps for natively initialized apps
[🟨] Jet client disconnected - normal closure (code = 1000).
[🟩] Jet client connected from "127.0.0.1:40293".


  18 passing (4s)