[Core] Allow env setup logger encoding

[GeneDer]

Why are these changes needed?

Added RAY_LOGGING_CONFIG_ENCODING env to config Ray logger encoding even when ray.init isn't called with a logging config.

Will follow up with a product PR to enable it for Services.

Related issue number

Closes #46125

Checks

• I've signed off every commit(by using the -s flag, i.e., git commit -s) in this PR.
• I've run scripts/format.sh to lint the changes in this PR.
• I've included any doc changes needed for https://docs.ray.io/en/master/.
  • I've added any new APIs to the API Reference. For example, if I added a
    method in Tune, I've added it in doc/source/tune/api/ under the
    corresponding .rst file.
• I've made sure the tests are passing. Note that there might be a few flaky tests, see the recent failures at https://flakey-tests.ray.io/
• Testing Strategy
  • Unit tests
  • Release tests
  • This PR is not tested :(

[GeneDer]

The diff looks kinda odd, but this is pretty much the same test as the one above except this env is set here and that one line 254 ray.init isn't called with logging config

[GeneDer]

@jjyao if this also LGTY can you help to merge it so I can follow up with the product change 🙏