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Add `head` property to `FileDownloadDelegate`'s `Progress`/`Response`… #242

Job	Run time
Unit tests / Construct unit test matrix	4s
Unit tests / Unit tests / Linux (5.9)	4m 32s
Unit tests / Unit tests / Linux (5.10)	4m 29s
Unit tests / Unit tests / Linux (6.0)	5m 5s
Unit tests / Unit tests / Linux (nightly-6.1)	5m 41s
Unit tests / Unit tests / Linux (nightly-main)	5m 36s
	25m 27s

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