Add exists check in download_to #982

Job	Run time
Code Quality	20s
Mocked Tests (ubuntu-latest, Python 3.8)	1m 5s
Mocked Tests (ubuntu-latest, Python 3.9)	1m 8s
Mocked Tests (ubuntu-latest, Python 3.10)	1m 7s
Mocked Tests (ubuntu-latest, Python 3.11)	1m 10s
Mocked Tests (ubuntu-latest, Python 3.12)	1m 33s
Mocked Tests (macos-latest, Python 3.8)	1m 34s
Mocked Tests (macos-latest, Python 3.9)	1m 29s
Mocked Tests (macos-latest, Python 3.10)	1m 23s
Mocked Tests (macos-latest, Python 3.11)	1m 7s
Mocked Tests (macos-latest, Python 3.12)	1m 29s
Mocked Tests (windows-latest, Python 3.8)	3m 50s
Mocked Tests (windows-latest, Python 3.9)	3m 22s
Mocked Tests (windows-latest, Python 3.10)	3m 30s
Mocked Tests (windows-latest, Python 3.11)	3m 35s
Mocked Tests (windows-latest, Python 3.12)	3m 50s
Live Tests	9m 31s
Test independent installs of clients (s3)	20s
Test independent installs of clients (azure)	19s
Test independent installs of clients (gs)	22s
Notify failed build	0s
	42m 4s

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