Remove storing entire original entityDescriptor in parsed metadata
Remove storing entire original entityDescriptor in parsed metadata

Storing this in each parsed entity has a significant performance impact.
It was originally added in fe80b8ad59fd1a07e8ff1eadd234318a083466f5 for
use by the 'aggregator' module, which is now replaced by the 'aggregator2'
module which does not use this field.

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