Add better error handling and fix some bugs
What does this MR do?
- Update common to fix a null bug, path bug, and add custom errors
- Update ruleset usage code to proper handle errors
What are the relevant issue numbers?
gitlab-org/gitlab#235358 (closed)
Does this MR meet the acceptance criteria?
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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