[backend] inferred data always have the Rule Manager's confidence (#6093)

[labo-flg]

Proposed changes

• remove confidence from the rules attribute behavior so it does not get averaged
• a patch from a rule always end up with confidence equals to the RULE_MANAGER_USER's max confidence level

Related issues

#6093

Checklist

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.68%. Comparing base (7a75b3a) to head (d021019).
Report is 7 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6098      +/-   ##
==========================================
+ Coverage   66.58%   66.68%   +0.10%     
==========================================
  Files         540      540              
  Lines       64270    64268       -2     
  Branches     5223     5267      +44     
==========================================
+ Hits        42791    42859      +68     
+ Misses      21479    21409      -70     

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