fix(db-mongodb): totalDocs with joins (#9056)

### What?
Fixes issue with incorrect `totalDocs` value when an aggregation is used
for `find`.
Previously, `limit: 5` for example always returned `totalDocs: 5`.

### Why?
`totalDocs` must be returned correctly.

### How?
Removes `$limit` from the pipeline, as `Model.aggregatePaginate` handles
it by itself.

packages/db-mongodb/src/find.ts

@@ -118,7 +118,6 @@ export const find: Find = async function find(
     collection,
     collectionConfig,
     joins,
-    limit,
     locale,
     query,
   })

packages/db-mongodb/src/queryDrafts.ts

@@ -115,7 +115,6 @@ export const queryDrafts: QueryDrafts = async function queryDrafts(
     collection,
     collectionConfig,
     joins,
-    limit,
     locale,
     projection,
     query: versionQuery,