Make controllers/ golint compatible

[turbaszek]

KEDA uses golint to ensure code quality. However, some files still need adjusting:

• controllers/scaledjob_controller.go
• controllers/scaledobject_controller.go
• controllers/util/status.go
• controllers/util/string_lists.go

How

1. Create a new branch from v2branch
2. Remove the files from list in .pre-commit-config.yaml
3. Either run pre-commit go-lint --all-files (this requires installed pre-commit) or golint path/to/selected/file.go
4. Commit your changes and open a PR to v2

Reference

#1025 (comment)