Implement /credentials/shop/ as flask view

[britneywwc]

Done

• Removed /credentials/shop/ that was previously a React app and implement in flask view

QA

• Check out this feature branch
• Run the site using the command ./run serve or dotrun
• View the site locally in your web browser at: http://0.0.0.0:8001/
  • Be sure to test on mobile, tablet and desktop screen sizes
• Go to /credentials/shop/
• Purchase an exam
• Should redirect to the checkout page with the correct exam & price

Issue / Card

Fixes WD-8193

Help

QA steps - Commit guidelines

[webteam-app]

Demo starting at https://ubuntu-com-13464.demos.haus

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.41%. Comparing base (0e757cc) to head (b0d2d01).
Report is 138 commits behind head on main.

❗ Current head b0d2d01 differs from pull request most recent head 7a5e036. Consider uploading reports for the commit 7a5e036 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13464      +/-   ##
==========================================
- Coverage   74.49%   74.41%   -0.08%     
==========================================
  Files         107      107              
  Lines        2854     2838      -16     
  Branches      954      946       -8     
==========================================
- Hits         2126     2112      -14     
+ Misses        704      702       -2     
  Partials       24       24              

see 3 files with indirect coverage changes