Remove --preview as a required flag for ruff server

crates/ruff/src/commands/server.rs

@@ -4,12 +4,7 @@ use crate::ExitStatus;
 use anyhow::Result;
 use ruff_server::Server;
 
-pub(crate) fn run_server(preview: bool, worker_threads: NonZeroUsize) -> Result<ExitStatus> {
- if !preview {
- tracing::error!("--preview needs to be provided as a command line argument while the server is still unstable.\nFor example: `ruff server --preview`");
- return Ok(ExitStatus::Error);
- }
-
+pub(crate) fn run_server(_preview: bool, worker_threads: NonZeroUsize) -> Result<ExitStatus> {
  let server = Server::new(worker_threads)?;
 
  server.run().map(|()| ExitStatus::Success)