PIM-2347 Refreshed product before adding groups

Otherwise UOW doesn't see any changes in the Product groups
PIM-2347 Synchronize entity ids before flushing documents
PIM-2347 Restored refresh calls in fixtures context
PIM-2347 Overrided groups and in group filters with mongodb
Moved product filter scenario to their own directory
PIM-2347 Fixed mongodb custom types subscriber specs
Merge branch 'master' into mongo/pim-2347
PIM-2347 Fixed product query builder usage in group filters
PIM-2347 Prevent unecessary calls to the uow schedule to update method
PIM-2347 Fixed CS
PIM-2347 Removed unused use statements
Merge pull request #981 from akeneo/mongo/pim-2347

[Mongo] Filter by groups and categories (entities type)