As part of the support for Split (https://jira.mongodb.org/browse/CLOUDP-121874), Automation needs to be able to configure tasks with the new --serverless arg (https://jira.mongodb.org/browse/CLOUDP-120643)

To do so, Automation configures and sets this via the conf file. However, tests revealed an error Unrecognized option: replication.serverless

There was a previous attempt to do this in https://jira.mongodb.org/browse/SERVER-72245, however it appears the conf file corresponds to the yaml source (rather than ini, which was previously added)

Automation currently has a workaround to pass the replication.serverless flag via command line, but for consistency should eventually be updated to the conf file