feat：为fetch、lfs和merge命令补充测试示例 #3827

Job	Run time
Full Test (ubuntu, self-hosted, Linux, X64, /home/github)	11m 50s
Test Monobean for macos	5m 21s
Fuse Clippy Check	10m 37s
Full Test (windows, self-hosted, X64, Windows, C:\Users\meagl)	11m 38s
Test Monobean for windows	5m 14s
Clippy Check	7m 26s
Test Monobean for ubuntu	6m 59s
Full Test (macos, self-hosted, macOS, ARM64, /Users/eli)	7m 14s
	1h 6m 19s

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