[chore] Remove impi tool

[dmitryax]

This is redundant. We already use go fmt and goimport linter for the same purpose. Unblocks #6189 because impi doesn't support more than one local prefix

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 44.51%. Comparing base (9a2a707) to head (6048629).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6190      +/-   ##
==========================================
+ Coverage   44.47%   44.51%   +0.04%     
==========================================
  Files         390      390              
  Lines       26993    26993              
==========================================
+ Hits        12004    12016      +12     
+ Misses      14150    14139      -11     
+ Partials      839      838       -1     

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