Use attribute, if exists, in arel converted virtual_columns
Use attribute, if exists, in arel converted virtual_columns

In cpu_usagemhz_rate_average_max_over_time_period and
derived_memory_used_max_over_time_period in VmOrTemplate::RightSizing,
make use of the attribute, if it exists, when calling the method,
otherwise generate it via the orginal call.

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