ci: skip running go checks when no relevant files were changed

[cecobask]

What this PR does / why we need it

Skip triggering CI checks when no .go files were changed in pull requests. For example, this pull request doesn't require any go checks but they still ran: https://github.com/yonahd/kor/pull/251

PR Checklist

• [x] This PR adds exceptions
• [ ] This PR add new code
• [ ] This PR includes test for any new code

Github Issue

[XX-XX]

Notes for your reviewers

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 43.60%. Comparing base (333b525) to head (52e27a7).

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #254 +/- ## ======================================= Coverage 43.60% 43.60% ======================================= Files 58 58 Lines 2768 2768 ======================================= Hits 1207 1207 Misses 1382 1382 Partials 179 179 ```

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