Implement /credentials/shop/webhook_responses in flask view

[britneywwc]

Done

• Removed/credentials/shop/webhook_responses that was previously a React app and implemented as 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/webhook_responses
• The page should function as it did previously with the React implementation

Issue / Card

Fixes WD-8194

Help

QA steps - Commit guidelines

[webteam-app]

Demo starting at https://ubuntu-com-13469.demos.haus

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.49%. Comparing base (6e36f97) to head (d3afd16).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #13469   +/-   ##
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  Coverage   74.49%   74.49%           
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  Files         107      107           
  Lines        2854     2854           
  Branches      954      954           
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  Hits         2126     2126           
  Misses        704      704           
  Partials       24       24