TRAC-303: add optional options param to getByName for multi-lang support

[bc-yevhenii-buliuk]

Jira: TRAC-303

What/Why?

This PR adds optional options param to getByName() for multi-lang support

BigCommerce supports multi-language via URL subfolder locales (e.g. /fr, /de).
When a shopper is on site.com/fr, AJAX requests must include the /fr prefix so the server returns translated content.
getByName() previously hardcoded {} as options, making it impossible to pass baseUrl
from the theme. As a result, the country-states request was sent to /remote/v1/country-states/{name}
instead of /fr/remote/v1/country-states/{name}, and state names were returned untranslated.

Rollout/Rollback

revert the PR

Testing

trac_303_testing_on_Integration.mov

---

Note

Low Risk
Small, backwards-compatible change limited to request option passing plus unit tests; low risk aside from potential edge cases in argument detection.

Overview
Updates Country.getByName to accept an optional options argument and forward it to remoteRequest, while remaining backwards-compatible with the legacy (name, callback) signature.

Adds Jest coverage to ensure the correct URL is used, options (including baseUrl for multi-language subfolder locales) are passed through, and undefined options are handled safely.

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[funivan]

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🎉 This PR is included in version 6.21.0 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)
• 6.21.0

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