Remove git.Commit referenced Tree object to let it portable #35356
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This PR removes a flawed design where
git.Commit
depended ongit.Tree
, andgit.Tree
in turn depended ongit.Repository
.Now,
git.Commit
only stores theTreeID
as a field. To retrieve the tree of a commit, you can useNewTree
.This change makes
git.Commit
more portable, allowing commit objects to be transferred across machines when necessary.submoduleCache
toTree
as field and renameCommitSubmoduleFile
toSubmoduleFile