wp-env: Ensure the environment is used with the logs command. (#27907)

While I was debugging something I noticed I was working with the test
environment rather than the main development one. I realised I couldn't
switch to tailing the logs of the test environment, and it was because
the optional parameter wasn't being passed to the command.

This change fixes that, by adding the optional parameter to the command
definition.

packages/env/lib/cli.js

@@ -131,7 +131,7 @@ module.exports = function cli() {
 		withSpinner( env.clean )
 	);
 	yargs.command(
-		'logs',
+		'logs [environment]',
 		'displays PHP and Docker logs for given WordPress environment.',
 		( args ) => {
 			args.positional( 'environment', {