Refactor CatFile batch implementation and introduce batch-command for git 2.36 #34651
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For git version 2.36,
git cat-file --batch-commandwas introduced which can replacegit cat-file --batchandgit cat-file --batch-check.This PR implements an abstract layer for the batch commands so that both git 2.36 and lower version git can work.
If git version is lower than 2.36, it will start two subprocesses
git cat-file --batchandgit cat-file --batch-check.If git version is greater than 2.36, only
git cat-file --batch-commandwill be started.This reduced half of child processes of git catfiles.