fix(remote-config, getAll): init with empty config

[mikehardy]

Description

previously if you incorrectly called getAll before setting defaults or fetching any
remote config, we would crash.

Now we initialize values as an empty object, so we have a graceful failure

confirmed via code inspection that this matches expecations from firebase-js-sdk
https://github.com/firebase/firebase-js-sdk/blob/acc58102d4429ce0593ec22192e76018e9d16ed7/packages/remote-config/test/remote_config.test.ts#L333-L335

Related issues

Fixes #5854, Fixes #5855

Release Summary

rebase merge the conventional commits

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

I refactored the remote config tests to put the non-native ones in a jest config and verified those worked
I added a new jest test that probed this, and failed as expected
I repaired this in a way that seems compatible with firebase-js-sdk and the test passed

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[codecov]

Codecov Report

Merging #5859 (ac3911c) into main (d0d9bd8) will increase coverage by 0.02%.
The diff coverage is 100.00%.

❗ Current head ac3911c differs from pull request most recent head 5ab2462. Consider uploading reports for the commit 5ab2462 to get more accurate results

@@             Coverage Diff              @@
##               main    #5859      +/-   ##
============================================
+ Coverage     52.98%   52.99%   +0.02%     
- Complexity      620      626       +6     
============================================
  Files           208      208              
  Lines         10118    10148      +30     
  Branches       1589     1606      +17     
============================================
+ Hits           5360     5377      +17     
- Misses         4503     4519      +16     
+ Partials        255      252       -3