Provide a default CopyStrategy overload for copyItem. #260

Job	Run time
Integration Tests / Linux (5.8)	13m 8s
Soundness / Broken symlinks check	4s
Soundness / API breakage check	2m 27s
Integration Tests / Linux (5.9)	14m 35s
Soundness / Documentation check	1m 58s
Integration Tests / Linux (5.10)	14m 13s
Integration Tests / Linux (nightly-6.0)	17m 1s
Soundness / License headers check	7s
Soundness / Format check	48s
Integration Tests / Linux (nightly-main)	17m 44s
Soundness / Shell check	8s
Soundness / Unacceptable language check	4s
Swift 6 Language Mode / Swift 6 language mode	1m 4s
Benchmarks / Benchmarks / Linux (5.8)	2m 44s
Benchmarks / Benchmarks / Linux (5.9)	3m 43s
Benchmarks / Benchmarks / Linux (5.10)	3m 40s
Benchmarks / Benchmarks / Linux (nightly-6.0)	5m 1s
Benchmarks / Benchmarks / Linux (nightly-main)	5m 6s
Cxx interop / Cxx interop / Linux (5.8)	1m 5s
Cxx interop / Cxx interop / Linux (5.9)	1m 13s
Cxx interop / Cxx interop / Linux (5.10)	1m 7s
Cxx interop / Cxx interop / Linux (nightly-6.0)	1m 49s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 49s
Unit tests / Unit tests / Linux (5.8)	3m 11s
Unit tests / Unit tests / Linux (5.9)	3m 27s
Unit tests / Unit tests / Linux (5.10)	3m 35s
Unit tests / Unit tests / Linux (nightly-6.0)	4m 25s
Unit tests / Unit tests / Linux (nightly-main)	4m 29s
	2h 9m 45s

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