LU-18806 dne: migrate to skip non-migratable files

LU-18806 dne: migrate to skip non-migratable files

Allow migrate and dir restripe to skip open files
and files with LinkEA overflow and continue the
migrate operation.

HPE-bug-id: LUS-12783
Signed-off-by: Alexander Zarochentsev <alexander.zarochentsev@hpe.com>
Change-Id: I4fa4cbe49d7681cdda9ba1d043f3c0a8a5d0efe9
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/58402
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andrew Perepechko <andrew.perepechko@hpe.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>