add setState to prevent submitting twice before character count is reset

[CollinBeczak]

Resolves: #2198

[codecov-commenter]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (921fcfe) 23.72% compared to head (3fccc2c) 23.72%.
Report is 4 commits behind head on main.

Files	Patch %	Lines
...rc/components/TaskCommentInput/TaskCommentInput.js	0.00%	3 Missing and 1 partial ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2215      +/-   ##
==========================================
- Coverage   23.72%   23.72%   -0.01%     
==========================================
  Files         648      648              
  Lines       22344    22345       +1     
  Branches     6896     6897       +1     
==========================================
  Hits         5301     5301              
  Misses      14252    14252              
- Partials     2791     2792       +1     

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