Improve retrying downloads code and testing#1559

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yarikoptic wants to merge 3 commits intomasterfrom gh-1556

+133-29

Commits on Dec 20, 2024

Simplify: a single log.debug invocation for any case which leads to sleep
yarikoptic
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Retry-After is provided by 429 (too many) so retry on that too
yarikoptic
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Handle Retry-After as a date, and add tests for all logic of checking attempts
yarikoptic
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