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

Utility/Url.hs

@@ -313,7 +313,7 @@ getUrlInfo url uo = case parseURIRelaxed url of
 
 	existsfile u = do
 		let f = toRawFilePath (unEscapeString (uriPath u))
-		s <- catchMaybeIO $ R.getFileStatus f
+		s <- catchMaybeIO $ R.getSymbolicLinkStatus f
 		case s of
 			Just stat -> do
 				sz <- getFileSize' f stat