rm --preserve-root should work on symlink too #1408

Job	Run time
Style/format (ubuntu-latest, feat_os_unix)	15s
Style/lint (windows-latest, feat_os_windows)	3m 37s
Style/lint (ubuntu-latest, all, true)	2m 37s
Style/Python	1s
Style/lint (macos-latest, feat_os_macos)	9m 35s
Pre-commit hooks	1s
Style/toml	9m 35s
Style/spelling (ubuntu-latest, feat_os_unix)	9m 35s
	35m 16s

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