For upcoming feature work, we want the ability to make a single request to publish a bunch of individual items (review requests and reviews) all together. To do this, we're introducing a new API-like endpoint for performing batch operations. This doesn't exist in the official API because it doesn't really mesh well with REST, and the actual endpoint may be in flux for a bit. We already have some batch-like operations in the dashboard UI that currently just make a whole bunch of API requests for closing review requests or changing visibility state. This new endpoint will also enable these workflows, so we can handle it much more efficiently. The new batch endpoint supports these operations: * close * discard * archive * mute * unarchive (effectively unmute too) * publish Testing Done: - Looked at e-mail previews for batch publishes with all combinations of review requests, review request updates, reviews, and review replies in both HTML and text mode. - Used all operations except for publish from real UI. - Ran unit tests.