Fix optimistic ui for comments

[beagleknight]

🎩 What? Why?

There was a small issue when creating a comment and the list of comments disappears briefly. It was caused by a small bug on the optimistic ui which was missing a field.

I also reimplemented the add comment form validation using only react because it was causing a false input error when adding a comment.

📌 Related Issues

• Fixes Comments disappear when adding a new one #980

📋 Subtasks

None

📷 Screenshots (optional)

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👻 GIF

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[mention-bot]

@beagleknight, thanks for your PR! By analyzing the history of the files in this pull request, we identified @lastpotion and @josepjaume to be potential reviewers.

[codecov-io]

Codecov Report

Merging #987 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #987      +/-   ##
==========================================
+ Coverage   97.17%   97.18%   +<.01%     
==========================================
  Files         385      385              
  Lines        6345     6358      +13     
==========================================
+ Hits         6166     6179      +13     
  Misses        179      179

Impacted Files	Coverage Δ
decidim-core/app/helpers/decidim/layout_helper.rb	55.17% <ø> (-5.44%)	❌
...cidim-core/lib/decidim/features/base_controller.rb	100% <ø> (ø)	✅
...cidim-core/app/helpers/decidim/meta_tags_helper.rb	100% <ø> (ø)	✅

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