Run columnstore upgrade on specified architectures only

[grooverdan]

This prevents a no-op on ppc64le

extracted out of #831 to get builder list one no-op builder shorter

two arches only:
https://github.com/MariaDB/server/blob/main/storage/columnstore/CMakeLists.txt#L54-L56

[RazvanLiviuVarzaru]

Fair enough, builders were already burning electricity just to say

WARNING: Columnstore was not found in the released packages, the test will not be run

Can you update rpm-upgrade.sh also?

  columnstore)
    package_list=$(rpm_repoquery)
    if ! echo "$package_list" | grep -q columnstore-engine; then
      bb_log_warn "Columnstore was not found in the released packages, the test will not be run"
      exit
    fi
    package_list="MariaDB-server MariaDB-columnstore-engine"
    alternative_names_package_list=$package_list
    ;;
  *)
    bb_log_err "unknown test mode ($test_mode)"
    exit 1
    ;;
esac

[RazvanLiviuVarzaru]

Note to self, If merging to main then immediately deploy and restart autogen ppc64le master to re-load the configuration.