rules_r: use 'source' pkg type when querying remote repos
rules_r: use 'source' pkg type when querying remote repos

Reviewers: cchang

Reviewed By: cchang

Differential Revision: https://phabricator.grailbio.com/D12743

fbshipit-source-id: b33fc9b

grailbio/rules_r,grailbio/rules_r,grailbio/rules_r,grailbio/rules_r,grailbio/rules_r