tape: fix snapshot path in catalog and snapshot_archive

both used the 'Display' trait of pbs_datastore::BackupDir, which is not
intended to be serialized anywhere. Instead, manually format the path
using the print_ns_and_snapshot helper, and conversely, parse with
'parse_ns_and_snapshot'. to be a bit safer, change the register_snapshot
signature to take a BackupNamespace and BackupDir instead of a string.

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>

src/tape/file_formats/snapshot_archive.rs

@@ -22,7 +22,9 @@ pub fn tape_write_snapshot_archive<'a>(
     writer: &mut (dyn TapeWrite + 'a),
     snapshot_reader: &SnapshotReader,
 ) -> Result<Option<Uuid>, std::io::Error> {
-    let snapshot = snapshot_reader.snapshot().to_string();
+    let backup_dir = snapshot_reader.snapshot();
+    let snapshot =
+        pbs_api_types::print_ns_and_snapshot(backup_dir.backup_ns(), backup_dir.as_ref());
     let store = snapshot_reader.datastore_name().to_string();
     let file_list = snapshot_reader.file_list();