Fix a bug where lfs gc never worked. (#35198) #35255
                
     Merged
            
            
          
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Backport #35198 by @lunny
Fix #31113
After #22385 introduced LFS GC, it never worked due to a bug in the INI library: fields in structs embedded more than one level deep are not populated from the INI file.
This PR fixes the issue by replacing the multi-level embedded struct with a single-level struct for parsing the cron.gc_lfs configuration.
Added a new test for retrieving cron settings to demonstrate the bug in the INI package.