Fix(CI): Update api-reference path in `pr_labeler`

PR #8333 modified the `api-reference` folder structure. Need to update it in `pr_labeler` job
<think>
PR Context:
- Title: fix(ci): Update api-reference path in pr_labeler job
- Merged: 2025-06-16T11:54:06Z
- Files changed: 2 files
- Commits: 2 commits

Implementation approach:
## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [x] Bugfix
- [ ] New feature
- [ ] Enhancement
- [ ] Refactoring
- [ ] Dependency updates
- [ ] Documentation
- [x] CI/CD

## Description
<!-- Describe your changes in detail -->
- Updated OpenAPI spec path in `pr_labeler` CI job
- Modified `CODEOWNERS` file to remove deleted folder 

### Additional Changes

- [ ] This PR modifies the API contract
- [ ] This PR modifies the database schema
- [ ] This PR modifies
</think>

To implement this, you'll need to modify:


(No detailed commit information available)
{"issue_number": 8343, "pr_number": 8344, "commits_count": 0, "files_changed": 2, "response_length": 782, "file_count": 0, "needs_breakdown": false}