* Fix partial cloning a repo (#18373)
- Backport from: #18373
- Backport isn't 1-1, because the frontport had a refactor in that area,
which v1.16 doesn't have.
* Include diff & use copy
* Add partial clone test
* patch
* Apply suggestions from code review
* globalArgs first
* avoid copy but make GlobalCMDArgs append first
* please linter
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: 6543 <6543@obermui.de>