Adds to the "Show/Hide Replies" buttons a count of how many replies a comment thread contains.
Bonus
Prevents the "Cancel" button from appearing for the overall comment draft form at the bottom of the Submission Review page. Note: this button still appears for the draft form for overall comment replies.
Adds a missing property to SubmissionsPage.vitest.spec.js
This pull request:
SubmissionsPage.vitest.spec.js
Closes #2070