Remove CUI

[matmair]

This PR removes CUI and adjacent helpers that are no longer required.

Part of the preparation for 1.0 as listed in the blog.

closes #5754

[netlify]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.23%. Comparing base (5d23296) to head (b6bf72b).
Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8384      +/-   ##
==========================================
+ Coverage   84.57%   85.23%   +0.66%     
==========================================
  Files        1199     1176      -23     
  Lines       54527    52524    -2003     
  Branches     2074     2074              
==========================================
- Hits        46117    44771    -1346     
+ Misses       7906     7247     -659     
- Partials      504      506       +2     

Flag	Coverage Δ
backend	86.92% <ø> (+0.87%)	⬆️
migrations	43.15% <ø> (+0.39%)	⬆️
pui	69.09% <ø> (+0.05%)	⬆️

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[SchrodingersGat]

That's a lot of code removed :)

[matmair]

@SchrodingersGat not even all - just the parts I think that are safe. I will open PRs that port over all the test changes to 0.17.0 already to make the diff of modified files smaller in this changeset. Things like the middleware tests

[matmair]

@SchrodingersGat this is ready for review and merge once 0.17.0 is done; there will be some smaller follow-ups probably (removing all ajax, removing some frontend dependencies in backend). Keeping this in this state to leave it review-able.

[SchrodingersGat]

@matmair please fix conflicts here :)

[matmair]

@SchrodingersGat fixed

[SchrodingersGat]

@matmair should we remove the frontend URL prefix "platform" now? Or would you like to do that as a separate PR

[matmair]

I would like to keep changes to PUI separate from this whole CUI removal

[matmair]

+ We need to consider the migration story with old CUI links

[SchrodingersGat]

What a milestone! Thanks for all the amazing effort on this one @matmair

Obviously as this is a huge change, we will have a lot of follow up and potential triage here. Let's keep an eye on it .