Update and rename comment_test.rb to comment_system_test.rb to solve class name mismatch error

[yuzanawinnnn]

Renamed the file comment_test.rb as comment_system_test.rb and change the classname by writing the code class CommentSystemTest < ApplicationSystemTestCase.

Fixes #11620

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Hi 😄, this issue has been automatically marked as stale because it has not had recent activity. Don't worry you can continue to work on this and ask @publiclab/reviewers to add in-progress label 🎉 . Otherwise, it will be closed if no further activity occurs in 10 days -- but you can always re-open it if you like! 💯 Thank you for your contributions! 🙌 🎈.