Contact form improvements

[maribedran]

One-line summary

Improve error handling on the Contact Page form and create a new Country Select block.

Significant changes and points to review

• Indicate field errors with a message under the field and error styles on inputs
• Add a notification in case the user has JS disabled
• Create a new Country Select block with all country options gathered from Product Details

Issue / Bugzilla link

Testing

• Run ./manage.py load_page_fixtures and access http://localhost:8000/en-US/tests-index-page/test-contact-page/
• Check that the country select has multiple country options
  • Translate the page and check that the country names are translated
• Disable JavaScript and check that the notification appears

• Manually edit the HTML to trigger an invalid form submission (the browser by default won't let you submit the form) - remove the required attribute from the form fields or delete them entirely and submit the form

• Make sure you don't have Basket running to trigger an API error and submit a valid form. Check that the error message appears

[codecov]

Codecov Report

❌ Patch coverage is 95.65217% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 80.92%. Comparing base (0683fc5) to head (605e801).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
springfield/cms/models/pages.py	88.88%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1504      +/-   ##
==========================================
+ Coverage   80.90%   80.92%   +0.02%     
==========================================
  Files         147      147              
  Lines       10133    10144      +11     
==========================================
+ Hits         8198     8209      +11     
  Misses       1935     1935              

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