[x] Make sure there are generated JSON files from the YAML test files.
[ ] Test changes in at least one language driver.
[ ] Test these changes against all server versions and topologies (including standalone, replica set, sharded clusters, and serverless).
Note: PHPLIB currently has validation to prohibit empty pipelines for these operations, so these tests would necessitate removing that logic (re: PHPLIB-881).
https://jira.mongodb.org/browse/DRIVERS-2638
Please complete the following before merging:
Note: PHPLIB currently has validation to prohibit empty pipelines for these operations, so these tests would necessitate removing that logic (re: PHPLIB-881).