misc: Try to speed up group to filter migration #2130
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Context
Some customers using Lago on a self hosted mode have faced issue with the migration converting
GroupintoChargeFilter.The main point is that the part trying to migrate group attached to fees into charges is very very slow on system counting a lot off fees.
Description
This PR tries to remediate this situation by preloading as much records as possible to reduce the number of calls to the database.
It also fixes some edge case that could lead to duplicated filters on some charges