ci: remove gofmt linter because goimports includes it

[mboersma]

Reason for Change:

Goimports does everything that gofmt does. Additionally it checks unused imports

Issue Fixed:

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Notes:

This was cherry-picked from #2839 as that larger changeset is still being tested.

[codecov]

Codecov Report

Merging #3124 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3124   +/-   ##
=======================================
  Coverage   71.05%   71.05%           
=======================================
  Files         147      147           
  Lines       25671    25671           
=======================================
  Hits        18241    18241           
  Misses       6294     6294           
  Partials     1136     1136           

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[mboersma]

Closing because this #2839 merged.