DRIVERS-2914 : Summary of necessary driver changes  No functional changes have been made to the spec Note: due to a tooling error, the crud-aggregate-write-readPreference.json test file was not updated in the original commit (30b3a75) and was updated in a separate commit (30251e8). Commits for syncing spec/prose tests (and/or refer to an existing language POC if needed)  Synchronise the crud/db-aggregate-write-readPreference test to commit 30b3a75  Synchronise the crud/aggregate-write-readPreference test to commit 30251e8 Context for other referenced/linked tickets