Create column labels for tasks imported from Phabricator
Columns used on issue boards are available in the [`maniphest.search](https://phabricator.inverselink.com/conduit/method/maniphest.search/) like this: ```js "columns": { "boards": { "PHID-PROJ-hihi": { "columns": [ { "id": 16, "phid": "PHID-PCOL-haha", "name": "Backlog" } ] } } ``` We'd need to add a label for each project `phid` we encounter in the `boards` key, and add a `#{project_label}::#{column_label}` label for each column we encounter nested in it. We need to cache both the project-labels and column-labels in redis mapped to a GitLab label ID so we can reuse them for subsequent issues
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