convert hand-written enum as_str matches to strum derives workspace-wide

swarm-queue-client/Cargo.toml

@@ -47,6 +47,7 @@ async-nats.workspace = true
 reqwest = { workspace = true, features = ["blocking"] }
 serde.workspace = true
 serde_json.workspace = true
+strum.workspace = true
 # A library, so its errors are a matchable enum rather than an opaque
 # `anyhow::Error`. The binaries that consume this keep anyhow; `?` converts.
 thiserror.workspace = true