Repository.Init() creates unexpected symlink with `_git2_` prefix in working dir

Reproduction steps

Call Repository.Init(path) where path is an existing empty directory.

Expected behavior

path will contain a directory named .git and nothing else.

Actual behavior

There is also a symlink created which always has the prefix _git2_ and may look like this: _git2_a05400.

Version of LibGit2Sharp (release number or SHA1)

0.26.2

Operating system(s) tested; .NET runtime tested

win 10; net 5.0.202

从 Repository.Init(path) 入口点开始，在 Windows 上使用 .NET 5 和一个现有的空目录重现该问题。跟踪 git2 符号链接的创建位置，然后确认初始化后工作目录中只留下 .git 目录，以验证修复结果。