!refactor(backend): restructure user endpoints

[matmair]

This realigns the user API endpoints by:

• moving endpoints that only return results for the current user to /user/me/
• renaming the list endpoint for tokens from 'tokens' to 'token' as that name is now free

see #11433

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (next-breaking@213f5a9). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             next-breaking    #9604   +/-   ##
================================================
  Coverage                 ?   88.01%           
================================================
  Files                    ?     1295           
  Lines                    ?    58908           
  Branches                 ?     1938           
================================================
  Hits                     ?    51845           
  Misses                   ?     6581           
  Partials                 ?      482           

Flag	Coverage Δ
backend	89.20% <100.00%> (?)

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Components	Coverage Δ
Backend Apps	91.69% <0.00%> (?)
Backend General	93.37% <0.00%> (?)
Frontend	70.81% <0.00%> (?)

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[SchrodingersGat]

We are going to have to consider how we mix the "next-breaking" and "master" changes to the API - if we do not merge this into master we will run into conflicts.. Any thoughts how to handle this?

[matmair]

My immediate idea would be to have one API bump per major release that removes all deprecations and just push the API version up by one till merge comes, but I can see that this needs some better considerations

[matmair]

moving to draft while I think about the API change that was brought up