feat(live): ISO size reduction

[lslezak]

Live ISO improvements

Reduce the initrd and ISO size.

Delete not needed packages

• Remove Mesa packages, we do not need OpenGL support
• Remove libyui-qt and Qt libs
• Remove python (installed just because of two simple scripts which we do not use)
  • To avoid removing it accidentally when some new dependency appears there is a dependency check

Additional improvements

Some more improvements were copied from the openSUSE Tumbleweed Live ISO:

• Use a better compression for initrd (xz instead of zstd with the best compression level)
• Removed some AMD GPU firmware (likely need only for OpenCL or GPU computing)
• Copied Lenovo X13 dracut configuration, might be usable also on other ARM64 machines

Results (on x86_64)

• The total ISO size decreased from 692MB to 634MB (-58MB, -8%)
• The initrd size decreased from 87MB to 65MB (-22MB, -25%)

On different archs the numbers might be slightly different.

Note: XZ compression is more effective but requires more RAM and CPU for decompression, let's see how that will work on some PPC64 or ARM64 machines...

[jreidinger]

I think agama web ui should simply provide libyui backend, so it is not installed