Fix issue #6511 - CLI listing formatting ignored when passing --search

[pablodelarco]

This pull request addresses issue #6511, which concerns the CLI listing formatting being ignored when the --search option is used with the onevm list command.

The problem was pinpointed to a section of the onevm command located in src/cli. The issue occurred in the command definition block for :list, where the conditional logic did not account for --json and --yaml formatting options when the --search flag was used. Specifically, the block that needed modification was as follows:

command :list, list_desc, [:filterflag, nil],
        :options => CLIHelper::OPTIONS + OpenNebulaHelper::OPTIONS +
                    [OpenNebulaHelper::DESCRIBE] + [OneVMHelper::SEARCH] do
    # ...existing code...
    if options[:xml]
        puts pool.to_xml
    else
        table.show(pool.to_hash, options)
    end
    # ...
end

I introduced conditional branches to handle the --json and --yaml options:

if options[:xml]
    puts pool.to_xml
elsif options[:json]
    puts JSON.pretty_generate(pool.to_hash)
elsif options[:yaml]
    puts pool.to_hash.to_yaml

With these additions, the onevm list command now respects the --json and --yaml flags in conjunction with the --search flag, providing output in the expected format.