fix(zypp): Reuse the repositories, use libzypp in "chroot"

[lslezak]

Problem

• When changing the product from openSUSE Tumleweed to openSUSE MicroOS the Tumbleweed repository is refreshed again
• The code initializes the libzypp in the Live ISO system, there are some workarounds to avoid reusing the Live ISO repositories

Related cards:

• https://trello.com/c/liPX29Cu/3695-5-research-improve-software-management-performance

Solution

• When the changed product uses the same repositories then just reuse them, do not create the repositories again
• Run libzypp in /run/agama/zypp repository to not mess with the package management from the Live ISO, removed the related workarounds

Notes

• The reusing is simple all-or-nothing, i.e. the products must use the very same repositories. In the future we could improve it to allow reusing just a subset of the repositories.
• Maybe it will need some adoption when the system is registered, but as there is no real product to register I'm leaving this for the future.
• I put the zypp lock to /run/agama/zypp as well, that means now you can run zypper in the Live system while Agama is running, yay! 🤩
• That workaround with switching Yast::Stage is not needed anymore, it was needed when we run the proposal using the YaST code, it is not needed with the new refactored code.

Testing

• Tested manually (mvidner: in container, switched products 3 times, without hitting Install)

[coveralls]

coverage: 70.758% (-0.02%) from 70.773%
when pulling 8453f58 on zypp_fixes
into bc2c5d7 on master.

[mvidner]

I was wondering whether this could break the actual RPM installation, but apparently it's OK as TargetInitialize will be also called with the destination directory later:

60eaee65c80e:/ # grep TargetInit /var/log/YaST2/y2log
2024-06-13 12:31:25 <1> 60eaee65c80e(2007) [Pkg] software/manager.rb:154 Pkg Builtin called: TargetInitialize
2024-06-13 12:33:59 <1> 60eaee65c80e(2007) [Pkg] software/proposal.rb:157 Pkg Builtin called: TargetInitialize
2024-06-13 12:35:06 <1> 60eaee65c80e(2007) [Pkg] software/proposal.rb:157 Pkg Builtin called: TargetInitialize
2024-06-13 12:36:07 <1> 60eaee65c80e(2007) [Pkg] software/proposal.rb:157 Pkg Builtin called: TargetInitialize

This was me selecting a product 3 times, without hitting Install.

[lslezak]

Yes, later the target is later moved to /mnt. We can do this only after the installation is started, after the partitioning step.