[GR-46390] Use the FileFormatter in CI to produce less output and add --timeout

* The --timeout should help in case a spec hangs to at least print that spec's description.

Author: eregon

tool/jt.rb

@@ -1644,7 +1644,7 @@ def mspec(*args)
       options += %w[--excl-tag slow]
     end
 
-    options += %w[--format specdoc] if ci?
+    options += %w[--timeout 300] if ci?
 
     args, ruby_args = args_split(args)
     vm_args, ruby_args, parsed_options = ruby_options({}, ['--reveal', *ruby_args])