Add goimports as a managed tool via bingo

[bentito]

Description of the change:
Add goimports as a managed tool via bingo

Motivation for the change:
Other needed dev tools are installed via bingo, goimports should be too.

Reviewer Checklist

• Implementation matches the proposed design, or proposal is updated to match implementation
• Sufficient unit test coverage
• Sufficient end-to-end test coverage
• Docs updated or added to /docs
• Commit messages sensible and descriptive

[openshift-ci]

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[grokspawn]

I'll have to do a more thorough review later. Initial thoughts:

• in other o-f projects, we have migrated away from goimports to gosimports and now gci, c.f. operator-controller and we should be consistent.
• the lint target here doesn't actually lint anything??????????? Can we do something like operator-controller here again, and at least see how bad the lint is if we ran it?

I know this one looked like a quick-touch, but it seems more like an iceberg.
And if you want to capture ^^ in a new issue/PR, please write it up and add the reference here, and we can just use this one to idiot-proof our CI around the existing tooling.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.80%. Comparing base (a0a503e) to head (028498c).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1523   +/-   ##
=======================================
  Coverage   46.80%   46.80%           
=======================================
  Files         135      135           
  Lines       15760    15760           
=======================================
  Hits         7377     7377           
  Misses       7342     7342           
  Partials     1041     1041           

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[bentito]

well we can close this one if we've got plans to make things better, later.

[grokspawn]

Yeah, let's close this one in favor of #1524. It's a PITA (over 300 linter findings!) but it would un-do this PR entirely.