When an upload fails with a transient HTTP error (e.g., S3 rate limiting
with HTTP 503), retries would fail with "curl error: Failed to open/read
local data from file/application" because the upload source was already
exhausted from the previous attempt.
Restart the source in init() to ensure it's at the beginning for both
first attempts (no-op) and retries (necessary fix).
Fixes: #15023
(cherry picked from commit fbd787b910)
Nix
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