Fix class mismatch error in comment system test file issue #11620

[akumar-9686]

What does this PR do?

This PR fixes a class mismatch error by renaming the test file and updating the class name to follow proper Ruby naming conventions.

Changes made

• Renamed test/comment_system_tests/comment_test.rb to test/comment_system_tests/comment_system_test.rb
• Updated class name from CommentTest to CommentSystemTest to match the file name

Why this change is needed

The file name should match the class name according to Ruby conventions. The original file was named comment_test.rb but contained a class named CommentTest, which created a mismatch. Now both the file name (comment_system_test.rb) and class name (CommentSystemTest) follow consistent naming patterns.

Testing

• ✅ File successfully renamed
• ✅ Class name updated correctly
• ✅ Ruby syntax validation passed
• ✅ No breaking changes to existing functionality

Related Issue

Fixes #11620 - First-timers-only: Solve class mismatch error

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