Refactor git module, make Gitea use internal git config (#19732)
* Refactor git module, make Gitea use internal git config, add safe.directory config
* introduce git.InitSimple and git.InitWithConfigSync, make serv cmd use gitconfig
* use HOME instead of GIT_CONFIG_GLOBAL, because git always needs a correct HOME
* fix cmd env in cmd/serv.go
* fine tune error message
* Fix a incorrect test case
* fix configAddNonExist
* fix configAddNonExist logic, add `--fixed-value` flag, add tests
* add configSetNonExist function in case it's needed.
* use configSetNonExist for `user.name` and `user.email`
* add some comments
* Update cmd/serv.go
Co-authored-by: zeripath <art27@cantab.net>
* Update cmd/serv.go
Co-authored-by: zeripath <art27@cantab.net>
* Update modules/git/git.go
Co-authored-by: zeripath <art27@cantab.net>
* Update modules/setting/setting.go
Co-authored-by: zeripath <art27@cantab.net>
* Update modules/git/repo_attribute.go
Co-authored-by: zeripath <art27@cantab.net>
* fix spaces in messages
* use `configSet("core.protectNTFS", ...)` instead of `globalCommandArgs`
* remove GIT_CONFIG_NOSYSTEM, continue to use system's git config
* Update cmd/serv.go
Co-authored-by: zeripath <art27@cantab.net>
* fix merge
* remove code for safe.directory
* separate git.CommonEnvs to CommonGitCmdEnvs and CommonCmdServEnvs
* avoid Golang's data race error
Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
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