Issue #3413: move Kernel/cpan-lib to new directory backup

[bschmalhofer]

before copying /opt/otobo_install/otobo_next into /opt/otobo. Old Perl module should not linger.

[bschmalhofer]

The exact location of backup needs to be discussed. The current state is that an update would result in:

$tree -L 4 backup/ | more
backup/
└── 2024-05-24-100146_31386
    └── Kernel
        └── cpan-lib
            ├── Algorithm
            ├── CPAN
            ├── CSS
            ├── Class
            ├── Crypt
            ├── Data
            ├── Date
            ├── Devel
            ├── Email
             ...

[bschmalhofer]

This has been handled in a different PR.