[CI] Fix the golang lint issues

[Jeffwan]

Pull Request Description

Fix the existing linter reported issues to unblock the PR merge. Note, I disable unparam at this moment and it take some time to fix them in elegant way.

Related Issues

Resolves: #75

Important: Before submitting, please complete the description above and review the checklist below.

---

Contribution Guidelines (Expand for Details)

We appreciate your contribution to aibrix! To ensure a smooth review process and maintain high code quality, please adhere to the following guidelines:

Pull Request Title Format

Your PR title should start with one of these prefixes to indicate the nature of the change:

• [Bug]: Corrections to existing functionality
• [CI]: Changes to build process or CI pipeline
• [Docs]: Updates or additions to documentation
• [API]: Modifications to aibrix's API or interface
• [CLI]: Changes or additions to the Command Line Interface
• [Misc]: For changes not covered above (use sparingly)

Note: For changes spanning multiple categories, use multiple prefixes in order of importance.

Submission Checklist

• PR title includes appropriate prefix(es)
• Changes are clearly explained in the PR description
• New and existing tests pass successfully
• Code adheres to project style and best practices
• Documentation updated to reflect changes (if applicable)
• Thorough testing completed, no regressions introduced

By submitting this PR, you confirm that you've read these guidelines and your changes align with the project's contribution standards.

[M00nF1sh]

/lgtm

[M00nF1sh]

the UT seems passed, but E2E failed with HorizontalPodAutoscaler.autoscaling "test-resource-hpa" is invalid: [spec.scaleTargetRef.kind: Required value, spec.scaleTargetRef.name: Required value].
i think we can merge this and fix e2e separately