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

PullRequest: truffleruby/3844

Author: eregon

test/mri/excludes/TestRipper/Sexp.rb

@@ -1,3 +1,4 @@
 exclude :test_pattern_matching_415, "needs investigation"
 exclude :test_pattern_matching_427, "needs investigation"
 exclude :test_pattern_matching_439, "needs investigation"
+exclude :test_params_mlhs, "transient"

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])