Replace SkipPackageSuppliers.default_ usage with Nullable #3033
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Instead of having a different enum value for stating that the value is not specified and it should be taken from the configuration files, use a Nullable. This has been suggested in #2903 (comment)
The main reason for this change is going through the other places where the configuration files were not honored (e.g. dub lint) (which was the intent of the original PR). It would be a shorter change to modify the current code to use the .default_ enum value when it was appropriate but if I have to change the code I might as well go and implement the less error-prone solution with Nullable.