Sanitize label to fix duplicate mountpoints with spaces and parentheses (#1415)

[ermezavx]

This pull request enhances label sanitization for device-mapper names and mount points. Spaces and parentheses in filesystem labels are now replaced with underscores, preventing duplicate mountpoints and ensuring correct mount state reporting.
Fixes #1415.

[vojtechtrefny]

Jenkins, ok to test.

[vojtechtrefny]

I don't think this is fixing the linked issue. The label_to_safe_dm_name function affects only the device mapper name of the LUKS device, not the mount point (that's handled by sanitize_mount_point in udiskslinuxfilesystem.c). And I don't even think the parentheses in the mount point are the problem -- the problem is the detection of the mount point in this case udisks_linux_filesystem_update/udisks_mount_monitor_get_mounts_for_dev and most likely for Btrfs only (I cannot reproduce the issue with ext4, only with btrfs).

Edit: Ok, the problem is related to the device mapper name which than cannot be linked to the device, but that's still problem in the filesystem/mountpoint management code, sanitizing the dm name might fix it for this specific use case, but we should fix the core issue.