blob/azblob: Pass nil instead of an empty map for tags on Copy operation #2989
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Cloned from #2988 by @leezen, because it requires updating some golden files
Fixes #2982
Providing an empty map ends up causing the underlying SDK to want to have permissions to write tags against the destination blob. However, we don't actually need this permission since we're not really writing any tags. Instead, we should just pass in nil.