fix: return value for validateLint

[codebytere]

Fixes an issue where make lint doesn't return anything, so awaiting it would always return undefined on success and false-positive fail. Also adds logging output for successful lint.

cc @nodejs/node-core-utils

[codecov]

Codecov Report

Merging #482 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #482   +/-   ##
=======================================
  Coverage   82.59%   82.59%           
=======================================
  Files          34       34           
  Lines        1660     1660           
=======================================
  Hits         1371     1371           
  Misses        289      289           

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