pull requests: prevent adding DEFAULT user as reviewer Add a helper method to resolve reviewers, with an added check to prevent the adding of the DEFAULT user as reviewer. The __add_reviewers method, although internal, had a troubling interface where the method was responsible for resolving reviewers, but the caller was responsible for resolving mention_recipients. The method is changed to always take two sets of database User objects, leaving the resolution to the caller in both cases.

syntax: glob
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syntax: regexp
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