[datafeed] Commit after all deletions in datafeed parser
This avoids misleading validation error because schema constraints could be
temporarily broken depending on the deletion order.
Closes #4372127.
Latest changes
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* table of `all latest changes`_
Links below is providing useful RQL query example.
.. _all latest changes: view?rql=Any+M%2CX+WHERE+X+modification_date+M+ORDERBY+M+DESC+LIMIT+30