link: use proper exceptions (#6852)

* link: use proper exceptions

* system: use ENOTSUP instead of NotImplementedErrorwq

dvc/objects/checkout.py

@@ -1,3 +1,4 @@
+import errno
 import logging
 from itertools import chain
 
@@ -77,7 +78,9 @@ def _try_links(cache, from_info, to_info, link_types):
             _verify_link(cache, to_info, link_types[0])
             return
 
-        except DvcException as exc:
+        except OSError as exc:
+            if exc.errno not in [errno.EXDEV, errno.ENOTSUP]:
+                raise
             logger.debug(
                 "Cache type '%s' is not supported: %s", link_types[0], exc
             )