use getSymbolicLinkStatus not getFileStatus to avoid crash on broken symlink

Fix crash importing from a directory special remote that contains a broken
symlink.

The crash was in listImportableContentsM but some other places in
Remote.Directory also seemed like they could have the same problem.

Also audited for other places that have such a problem. Not all calls
to getFileStatus are bad, in some cases it's better to crash on something
unexpected. For example, `git-annex import path` when the path is a broken
symlink should crash, the same as when it does not exist. Many of the
getFileStatus calls are like that, particularly when they involve
.git/annex/objects which should never have a broken symlink in it.

Fixed a few other possible cases of the problem.

Sponsored-by: Lawrence Brogan on Patreon

Limit.hs

@@ -572,7 +572,7 @@ addAccessedWithin duration = do
   where
 	check now k = inAnnexCheck k $ \f ->
 		liftIO $ catchDefaultIO False $ do
-			s <- R.getFileStatus f
+			s <- R.getSymbolicLinkStatus f
 			let accessed = realToFrac (accessTime s)
 			let delta = now - accessed
 			return $ delta <= secs