fix: handle as-of timestamp for excluding file groups

[xushiyan]

Description

When getting excluding file groups, it should consider the as-of timestamp if provided.

How are the changes test-covered

• N/A
• Automated tests (unit and/or integration tests)
• Manual tests
  • Details are described below

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.02%. Comparing base (88f9f03) to head (7af068c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #268      +/-   ##
==========================================
+ Coverage   90.96%   91.02%   +0.05%     
==========================================
  Files          41       41              
  Lines        2037     2050      +13     
==========================================
+ Hits         1853     1866      +13     
  Misses        184      184              

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