feat: implemented restricted countries functionalities

[sundasnoreen12]

Description

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

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 50.00000% with 15 lines in your changes missing coverage. Please review.

Project coverage is 58.39%. Comparing base (9eda5e5) to head (5a9ae87).

Files with missing lines	Patch %	Lines
src/account-settings/data/service.js	0.00%	10 Missing and 1 partial ⚠️
src/account-settings/AccountSettingsPage.jsx	75.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1194      +/-   ##
==========================================
- Coverage   58.53%   58.39%   -0.15%     
==========================================
  Files         117      117              
  Lines        2320     2348      +28     
  Branches      639      648       +9     
==========================================
+ Hits         1358     1371      +13     
- Misses        901      915      +14     
- Partials       61       62       +1     

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[awais-ansari]

Please add a test case to improve test coverage.