Disables button on submit for the diffs
What does this MR do?
Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/39661 by disabling comment button before submission.
Are there points in the code the reviewer needs to double check?
No
Why was this MR needed?
Submitting a comment multiple times would produce multiple comments on diffs
Screenshots (if relevant)
Does this MR meet the acceptance criteria?
- Review
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Has been reviewed by Frontend
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Conform by the merge request performance guides