Revert "Remove service, migrate all to service-new (#1630)" (#1731)

This reverts commit d531ba561c.

polkadot/cli/src/cli.rs

@@ -79,10 +79,6 @@ pub struct RunCmd {
 	#[structopt(long = "force-westend")]
 	pub force_westend: bool,
 
-	/// Force using Rococo native runtime.
-	#[structopt(long = "force-rococo")]
-	pub force_rococo: bool,
-
 	/// Enable the authority discovery module on validator or sentry nodes.
 	///
 	/// When enabled: