After https://github.com/go-gitea/gitea/pull/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.
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Fix#9048 by cherrypicking the fix from Gitea
Gitea PR: https://github.com/go-gitea/gitea/pull/35198
Confirmed to work on my own instance, I now see the cron schedule for gc_lfs listed in the site admin menu where it was empty before
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## Release notes
<!--URL:https://codeberg.org/forgejo/forgejo-->
- Bug fixes
- [PR](https://codeberg.org/forgejo/forgejo/pulls/9202): <!--number 9202 --><!--line 0 --><!--description TEZTIEdDIGlzIG5ldmVyIHJ1bm5pbmcgYmVjYXVzZSBvZiBhIGJ1ZyBpbiB0aGUgcGFyc2luZyBvZiB0aGUgSU5JIGZpbGU=-->LFS GC is never running because of a bug in the parsing of the INI file<!--description-->
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Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/9202
Reviewed-by: Earl Warren <earl-warren@noreply.codeberg.org>
Co-authored-by: Andrew Cassidy <drewcassidy@me.com>
Co-committed-by: Andrew Cassidy <drewcassidy@me.com>
