Use router param for filepath in GetRawFile (#19499)
* Use router param for filepath
Signed-off-by: jolheiser <john.olheiser@gmail.com>
* Move TreePath back into RepoRefForAPI
Signed-off-by: jolheiser <john.olheiser@gmail.com>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: 6543 <6543@obermui.de>