In some cases, we want to exclude a directory's contents but not the directory itself. In other cases, we want to exclude a directory and its contents. Let's extend the denylist logic in copy.h to support both by changing the denylist from a set to hashmap so we can store the deny type as the value. We also modify the repart ExcludeFiles= option to make use of this. If a directory to exclude ends with a "/", we'll only exclude its contents. Otherwise, we'll exclude the full directory.
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