Improve retrying downloads code and testing#1559

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yarikoptic wants to merge 16 commits intomasterfrom gh-1556

+233-46

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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Commits on Jan 29, 2025

Replace UTC with use of timezone.utc for compatibility
yarikoptic
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Commits on Jan 31, 2025

RF: centralize retry-after parsing logic, add to other places where RETRY_CODES are used
yarikoptic
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Commits on Feb 3, 2025