fix: uninstall bson for mongo connector (#3104)
### Summary
Closes #3049. Reenables the MongoDB connector test, which was disabled
previously in #3047 due to incompatibility between the `pymongo` and the
`bson` package from `pip`, which is a dependency for the Astra
connector. Per the `pymongo` docs below, `pymongo` ships with its own
version of `bson` and installing `bson` from `pip` breaks `pymongo`.
- https://pymongo.readthedocs.io/en/stable/installation.html
### Testing
Ingest tests ran successfully for the [source
connector](https://github.com/Unstructured-IO/unstructured/actions/runs/9273154676/job/25512636315)
and the [destination
connector](https://github.com/Unstructured-IO/unstructured/actions/runs/9273154676/job/25512635546).
