Standardize logging with logrus

What does this MR do?

• Set logrus formatter with common's logutil package.
• Replace fmt print calls with the appropriate logrus calls.
• Add info logs when executing large steps.
• Add debug log for output exec calls.

What are the relevant issue numbers?

gitlab-org/gitlab#10880 (closed)

Does this MR meet the acceptance criteria?

• Changelog entry added
• Documentation created/updated for GitLab EE, if necessary
• [-] Documentation created/updated for this project, if necessary
• Documentation reviewed by technical writer or follow-up review issue created
• [-] Tests added for this feature/bug
• [-] Job definition updated, if necessary
  • [-] Auto-DevOps template
  • [-] Job definition example
  • [-] CI Templates
• Conforms to the code review guidelines
• Conforms to the Go guidelines
• Security reports checked/validated by reviewer