feat: Use partial index for negative queries
feat: Use partial index for negative queries

As recommended
[here](https://docs.cozy.io/en/tutorials/data/advanced/#partial-indexes),
we use partial indexes for negative queries. This is notably better to
have lighter indexes (the _id is not indexed anymore) and thus, more
efficient queries.

nono/cozy-files-v3,nono/cozy-files-v3,nono/cozy-files-v3,nono/cozy-files-v3