rhg review ready

Closed Pulkit Goyal requested to merge topic/default/rhg-review-ready into branch/default

rhg status is experimental right now and does not support all functionalities. While the long term target is to implement them, for now we add a fallback to have all tests pass with rhg status enabled.

Differential Revision: https://phab.mercurial-scm.org/D10906

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