Nas backup restore fails if the backup repository mount options have a trailing space

### problem

Backup works because mount options are processed inside the shell script `nasbackup.sh` where trailing spaces are not a problem.

But restore (`LibvirtRestoreBackupCommandWrapper`) builds and runs mount in Java

```

if (StringUtils.isNotBlank(mountOptions)) {
mountCmd.add("-o");
mountCmd.add(mountOptions);
}
Script.executeCommand(mountCmd.toArray(new String[0]));

```
Script.executeCommand(String...) builds a ProcessBuilder argument list
mount receives the literal -o "vers=4.1 ". libmount splits options only on commas, so the trailing blank stays glued to the last option, and mount.nfs/the kernel rejects it as a malformed or unknown option ("an incorrect mount option was specified").

`WARN utils.script.Script (logid:435302bd) Process [445800] for command [sudo /usr/bin/mount -t nfs encountered the error: [mount.nfs: an incorrect mount option was specified for /usr/share/cloudstack-agent/tmp/csbackup...`

### versions

ACS 4.22.1

### The steps to reproduce the bug

1. Create a backup repository - specify mount options (`vers=4.1 `) with a trailing space
2. Create backup
3. Restore backup - it fails
...

### What to do about it?

Trim trailing whitespaces before using the mount options

Beginne bei LibvirtRestoreBackupCommandWrapper und untersuche, wie mountOptions an Script.executeCommand übergeben werden; vergleiche dies mit der Shell-Verarbeitung in nasbackup.sh. Reproduziere die Wiederherstellung mithilfe einer Repository-Option mit nachgestellten Leerzeichen und überprüfe anschließend, dass die Wiederherstellung erfolgreich ist und das bestehende Verhalten des Mount-Befehls unverändert bleibt.

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