bookmarks: display the obsfate of hidden revision we create a bookmark on
Display the same message we added recently to the filtered error message
create a bookmark on an hidden revision.
Differential Revision: https://phab.mercurial-scm.org/D1870
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https://www.mercurial-scm.org/wiki/ContributingChanges
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273ce12ad8f1` will report some style violations on a very old commit).