feat(firestore): added support for non-default databases

[zeevl]

Description

Adds support for initalizing firestore with a non-default database

Related issues

Fixes #8456

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
  • Yes
• My change supports the following platforms;
  • Android
  • iOS
  • [x ] Other (macOS, web)
• 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

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Name	Status	Preview	Comments	Updated (UTC)
react-native-firebase	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 9, 2025 1:14pm

[CLAassistant]

All committers have signed the CLA.

[MichaelVerdon]

Hey there, thanks for the PR this looks good. Could you add a few tests for this please?

[github-actions]

Hello 👋, this PR has been opened for more than 2 months with no activity on it.

If you think this is a mistake please comment and ping a maintainer to get this merged ASAP! Thanks for contributing!

You have 15 days until this gets closed automatically

[MichaelVerdon]

Hey there 👋 , if I don't receive an update on whether you will add tests or not I will go and add them myself. (You will still get credited for this PR so don't worry about that).

[mikehardy]

Noting from issue thread: If unit tests are a barrier to merge, we need to add them to get this through, user commented that adding them isn't within capacity at the moment