feat: implemented restricted countries functionality

[sundasnoreen12]

Description

We are introducing a feature that allows platform administrators to restrict users from selecting one or more countries in Authn MFE.

How Has This Been Tested?

We retrieved the list of restricted countries by calling the following API:

👉 https://courses.edx.org/user_api/v1/account/registration/

At the same time, we obtained the translated country names using the i18n-iso-countries package.

Once both datasets were available, we filtered out the restricted countries from the translated list and displayed the updated country list in the UI.

Merge Checklist

• If your update includes visual changes, have they been reviewed by a designer? Send them a link to the Sandbox, if applicable.
• Is there adequate test coverage for your changes?

Post-merge Checklist

• Deploy the changes to prod after verifying on stage or ask @openedx/2u-infinity to do it.
• 🎉 🙌 Celebrate! Thanks for your contribution.

[codecov]

Codecov Report

Attention: Patch coverage is 52.17391% with 11 lines in your changes missing coverage. Please review.

Project coverage is 87.32%. Comparing base (5d481a9) to head (3355a01).

Files with missing lines	Patch %	Lines
src/common-components/data/service.js	0.00%	10 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1424      +/-   ##
==========================================
- Coverage   87.69%   87.32%   -0.37%     
==========================================
  Files         124      124              
  Lines        2299     2319      +20     
  Branches      646      650       +4     
==========================================
+ Hits         2016     2025       +9     
- Misses        274      284      +10     
- Partials        9       10       +1     

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[awais-ansari]

Please use 2u-main branch as base branch.