[backend/frontend] add more details to effective confidence level source

[labo-flg]

The effective confidence level is computed by the backend according top the user's level, their groups levels and their capabilities.

The model did not allow to know that the confidence source was the bypass capability, we only had user or group.

This PR improves the API about effective confidence level and allow the frontend to display precise information on why the user has such effective value, including the bypass capa case.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.73%. Comparing base (18c4db8) to head (3b995bb).
Report is 6 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6114   +/-   ##
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  Coverage   66.72%   66.73%           
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  Files         540      540           
  Lines       64180    64188    +8     
  Branches     5240     5240           
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+ Hits        42827    42835    +8     
  Misses      21353    21353           

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[lndrtrbn]

Missing generated file