Drop the AGPL license in favor of a source-available license. See the blog post [1] for details. [1] https://www.scylladb.com/2024/12/18/why-were-moving-to-a-source-available-license/
This uses the `trigger_snapshot()` API added in previous commit on a server running for the given Raft group. It can be used for example in tests or in the context of disaster recovery (ref scylladb/scylladb#16683).