cp: Added test for permissions copying to an existing file #16305

Job	Run time
Style/Python	7s
Pre-commit hooks	37s
Style/toml	14s
Style/format (ubuntu-latest, feat_os_unix)	17s
Style/spelling (ubuntu-latest, feat_os_unix)	19s
Style/lint (windows-latest, feat_os_windows)	3m 35s
Style/lint (macos-latest, feat_os_macos)	2m 7s
Style/lint (ubuntu-latest, all, true)	2m 21s
	9m 37s

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