Replace inconsistent msg_info calls with msg_warn for mirror-list warnings and msg_custom for "Attempting mirror" lines to unify output formatting in misc/build.func and misc/install.func. Simplify tools/pve/update-lxcs-cron.sh by removing the long mirror-probing block and using a straightforward apt-get update + noninteractive dist-upgrade (and cleanup of EXTERNALLY-MANAGED) in containers to reduce complexity and improve maintainability.
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