fix: update ReferrerNotFound error to be more accurate

[binbin-li]

Description

What this PR does / why we need it:

1. Modify ErrorCodeReferrersNotFound to ErrorCodeEmptyVerifierReport as it aligns better with the actual issue.
2. Revise the description of the error to list potential underlying causes.
3. Add WithDescription to custom error for improved printout capability.

Which issue(s) this PR fixes (optional, using fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when the PR gets merged):

Fixing one error in: #1321

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Helm Chart Change (any edit/addition/update that is necessary for changes merged to the main branch)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Please also list any relevant details for your test configuration

• Test A
• Test B

Checklist:

• Does the affected code have corresponding tests?
• Are the changes documented, not just with inline documentation, but also with conceptual documentation such as an overview of a new feature, or task-based documentation like a tutorial? Consider if this change should be announced on your project blog.
• Does this introduce breaking changes that would require an announcement or bumping the major version?
• Do all new files have appropriate license header?

Post Merge Requirements

• MAINTAINERS: manually trigger the "Publish Package" workflow after merging any PR that indicates Helm Chart Change

[akashsinghal]

Thanks for updating this! Just a reminder that we'll need to update the docs too :)

[binbin-li]

@yizha1 do you think if the new description makes sense to customers? Any suggestions for improvement?

[binbin-li]

synced with Yi offline, rename the error code to ErrorCodeNoVerifierReport

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (dev@56be5bb). Click here to learn what that means.

Additional details and impacted files

@@          Coverage Diff           @@
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  Files          ?      109           
  Lines          ?     5579           
  Branches       ?        0           
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  Hits           ?     3659           
  Misses         ?     1565           
  Partials       ?      355           

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