fix(db-mongodb): update mongoose-paginate-v2 to fix collation pagination (#16049)

## Summary

- Upgrades mongoose-paginate-v2 from 1.8.5 to 1.9.4 with my
[fix](aravindnc/mongoose-paginate-v2#241)
- Removes workaround code using `useCustomCountFn`

### Fixes included in 1.9.4:

- **Collation + session in transactions** - chaining `.collation()` on
`countDocuments` was breaking session context
- **limit in options.options** - was being passed to `countDocuments`,
causing incorrect `totalDocs` count

## Test plan

- [x] `pnpm test:int database` - all 160 tests pass
- [x] Collation tests specifically verified:
- `ensure mongodb respects collation when using collection in the
config`
  - `ensure mongodb collation works with draft pagination without sort`
  
Additional context #15990

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

Author: JarrodMFlesch

packages/db-mongodb/package.json

@@ -53,7 +53,7 @@
   },
   "dependencies": {
     "mongoose": "8.15.1",
-    "mongoose-paginate-v2": "1.8.5",
+    "mongoose-paginate-v2": "1.9.4",
     "prompts": "2.4.2",
     "uuid": "10.0.0"
   },

packages/db-mongodb/src/queryDrafts.ts

@@ -123,19 +123,6 @@ export const queryDrafts: QueryDrafts = async function queryDrafts(
         }),
       )
     }
-  } else if (!useEstimatedCount && this.collation) {
-    // Workaround for mongoose-paginate-v2 bug: chaining .collation() on countDocuments breaks
-    // session context in transactions (mongoose 8.x). Provide custom count function that passes
-    // collation as an option instead. See: https://github.com/aravindnc/mongoose-paginate-v2/pull/240
-    // TODO: Remove this workaround once mongoose-paginate-v2 is updated with the fix.
-    paginationOptions.useCustomCountFn = () => {
-      return Promise.resolve(
-        Model.countDocuments(versionQuery, {
-          collation: paginationOptions.collation,
-          session,
-        }),
-      )
-    }
   }
 
   if (limit && limit > 0) {
@@ -158,7 +145,6 @@ export const queryDrafts: QueryDrafts = async function queryDrafts(
     versions: true,
   })
 
-  // build join aggregation
   if (aggregate || sortAggregation.length > 0) {
     result = await aggregatePaginate({
       adapter: this,