Add go linter for workflow and repo.

[Tatsinnit]

This PR enables the golang linter all the changes for this PR is for the existing code and the errors it had.

Following PR achieves:

• Enabling GoLang Linter in repo.
• Add it to the git-workflow.

Thanks

Old error vs new run looks like this:

With Changes:

Without changes:

[arnaud-tincelin]

did you have a look at https://github.com/golangci/golangci-lint-action#how-to-use ?