I used to have a number of Mercurial repos in several projects. When Atlassian shut down all Mercurial repos they still remained hidden and are now inaccessible, but I can see them when I list workspaces, and they block me from re-creating the projects and repos with the same names. I'd like to delete the old Mercurial repos, but there's no way to do this that I can find.
Of the 21 repos in the picture below, only 9 can be accessed, the rest are hidden:

I'd like help with removing the hidden repos so I can re-create the previous Mercurial projects as Git repos. Thanks!