[backend/frontend] Improve readability of works in the connector interface

[CelineSebe]

Proposed changes

• add created_at for the in progress works, to see the oldest
• add counter for the 'In progress works' and 'Completed works'

Related issues

• Unable to see "active" job in connector interface when there are more than 50 jobs in progress. #8015

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant uses case (coverage and e2e)
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality

Further comments

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.41%. Comparing base (7d55b76) to head (310ac8a).
Report is 60 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9942      +/-   ##
==========================================
+ Coverage   64.29%   65.41%   +1.12%     
==========================================
  Files         655      656       +1     
  Lines       62933    63434     +501     
  Branches     6964     7851     +887     
==========================================
+ Hits        40460    41497    +1037     
+ Misses      22473    21937     -536     

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