feat(recommend): filter out input objectIDs [RECO-2436]

[raed667]

Summary

When requesting multiple objectIDs, there is a chance that the merged results contains some of the input items.

We can filter those out for a more consistent output.

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[Haroenv]

should this not be done backend? now the counts may be off

[raed667]

@Haroenv

should this not be done backend

The backend doesn't have a concept of a query with multiple objectIDs, they're treated as separate independent queries.

For example: getFBT(['obj1', 'obj2'] will result in 2 different Recommend calls, with the risk that getFBT('obj1') returns a list of recommendations that include obj2 and vise-versa

[Haroenv]

unavoidable to do this frontend for now, but I'd like to see the multi query move backend