[stable31] fix(S3): Only append streams if non-seekable #55670
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Later, when we rewind the stream in `writeMultiPart` during retry, both streams were rewinded, so the resulting stream was bigger than expected. Inspired by https://github.com/aws/aws-sdk-php/blob/master/src/S3/ObjectUploader.php#L136-L146 Signed-off-by: Louis Chmn <louis@chmn.me>
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Backport of PR #55654