feat(website): Add a happy message to playground output pane when no errors or AST (#5868)

[sviat9440]

PR Checklist

• Addresses an existing open issue: fixes Website: Add a happy message to playground output pane when no errors or AST #5868
• That issue was marked as accepting prs
• Steps in CONTRIBUTING.md were taken

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✅ Successfully ran 46 targets

• nx run-many --target=typecheck --all --parallel
• Node 18 - nx test @typescript-eslint/type-utils
• Node 18 - nx run-many --target=build --all --parallel --exclude website --exclude website
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• Node 18 - nx test @typescript-eslint/visitor-keys
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• Node 14 - nx test @typescript-eslint/typescript-estree --coverage=false
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• Node 14 - nx test @typescript-eslint/eslint-plugin --coverage=false
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• nx run-many --target=build --all --parallel --exclude website --exclude website

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[typescript-eslint]

Thanks for the PR, @sviat9440!

typescript-eslint is a 100% community driven project, and we are incredibly grateful that you are contributing to that community.

The core maintainers work on this in their personal time, so please understand that it may not be possible for them to review your work immediately.

Thanks again!

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[JoshuaKGoldberg]

Looks great, thanks for sending!

[JoshuaKGoldberg]

🚀

[codecov]

Codecov Report

Merging #5873 (e8e1518) into main (67744db) will increase coverage by 0.00%.
The diff coverage is n/a.

❗ Current head e8e1518 differs from pull request most recent head f7d21f1. Consider uploading reports for the commit f7d21f1 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5873   +/-   ##
=======================================
  Coverage   91.33%   91.33%           
=======================================
  Files         361      361           
  Lines       12044    12033   -11     
  Branches     3506     3503    -3     
=======================================
- Hits        11000    10990   -10     
+ Misses        748      747    -1     
  Partials      296      296           

Flag	Coverage Δ
unittest	91.33% <ø> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...-estree/src/create-program/createProjectProgram.ts	94.28% <0.00%> (+0.80%)	⬆️