comments(manager/gc): add NewAuditGCTask function

[yxxhero]

Description

Related Issue

Motivation and Context

Screenshots (if appropriate)

Types of changes

• 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 change)
• Documentation Update (if none of the other choices apply)

Checklist

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.

[Liam-Zhao]

LGTM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 34.35%. Comparing base (545f8c0) to head (64f13a3).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4048      +/-   ##
==========================================
- Coverage   34.43%   34.35%   -0.08%     
==========================================
  Files         344      344              
  Lines       40299    40299              
==========================================
- Hits        13875    13846      -29     
- Misses      25513    25538      +25     
- Partials      911      915       +4     

Flag	Coverage Δ
unittests	34.35% <ø> (-0.08%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
manager/gc/audit.go	0.00% <ø> (ø)

... and 6 files with indirect coverage changes

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