Re-enable remote-libp2pjs test configuration after fixing stability issues

[Rinse12]

Context

The remote-libp2pjs test configuration was temporarily disabled due to stability issues. This issue tracks all the locations where it was removed so re-enabling is straightforward once the underlying problems are resolved.

Locations to re-enable

• .github/workflows/CI.yml — add remote-libp2pjs back to both matrix configs:

  • Node remote configs matrix (~line 75): config: [remote-kubo-rpc, remote-ipfs-gateway, remote-libp2pjs]
  • Browser remote configs matrix (~line 121): config: [remote-kubo-rpc, remote-ipfs-gateway, remote-libp2pjs]

• src/test/test-util.ts — add "remote-libp2pjs" back to both browser and node arrays in getAvailablePlebbitConfigsToTestAgainst (~line 1450)

• test/node-and-browser/plebbit/test.configs.plebbit.test.ts — add "remote-libp2pjs" back to expected config codes in expectedCodes arrays (~line 16)

• package.json — add remote-libp2pjs back to these test scripts:

  • test:node:parallel:remote
  • test:node:remote
  • test:browser:chrome
  • test:browser:firefox
  • test:browser:chrome:parallel
  • test:browser:firefox:parallel

Steps to re-enable

1. Fix the stability issues causing remote-libp2pjs tests to fail
2. Re-add remote-libp2pjs to all locations listed above
3. Verify CI passes with the config re-enabled