Aggregate queries giving partial results upon 410

This is more of an improvement where we currently have a helper method(_merge_query_results) which gets called from cosmos client connection QueryFeed method and takes care of combining the results of aggregate queries. This code is fragile and can break. We should remove this helper method and try to use the core pipeline execution contexts to do the same.

Start with the _merge_query_results helper and the Cosmos client connection QueryFeed method that calls it. Read the surrounding core pipeline execution contexts to understand how aggregate results can be combined there. Done means the fragile helper is removed and aggregate queries still return complete results when a 410 occurs.

Scritto dal modello di indicizzazione a partire dal testo della issue.