Update minsev LogProcessor implementation

[MrAlias]

Implement the new definition of a LogProcessor.

Resolve #5967

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.5%. Comparing base (074af34) to head (19074d7).
Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #5994   +/-   ##
=====================================
  Coverage   65.5%   65.5%           
=====================================
  Files        203     203           
  Lines      12926   12926           
=====================================
  Hits        8474    8474           
  Misses      4198    4198           
  Partials     254     254           

Files	Coverage Δ
processors/minsev/minsev.go	100.0% <100.0%> (ø)