feat: refactor modals to use Dialog component and add tests for ApiKeyModal and ProviderConfigModal

[CodingOnStar]

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Summary

• Replaced Modal with Dialog in ApiKeyModal and ProviderConfigModal for improved UI consistency.
• Updated handling of modal open/close states.
• Added comprehensive tests for ProviderConfigModal, covering various tracing provider configurations.
• Enhanced ApiKeyModal tests to validate form schema handling and submission logic.

Checklist

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran make lint && make type-check (backend) and cd web && pnpm exec vp staged (frontend) to appease the lint gods

Fixes #35456
Fixes #35548

[codecov]

Codecov Report

❌ Patch coverage is 97.77778% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 85.59%. Comparing base (be4c828) to head (c41e9a6).
⚠️ Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
...omponents/plugins/plugin-auth/authorized/index.tsx	93.75%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #35550      +/-   ##
==========================================
- Coverage   85.59%   85.59%   -0.01%     
==========================================
  Files        4444     4452       +8     
  Lines      208236   208636     +400     
  Branches    38896    39044     +148     
==========================================
+ Hits       178238   178577     +339     
- Misses      26853    26914      +61     
  Partials     3145     3145              

Flag	Coverage Δ
dify-ui	93.01% <ø> (ø)
web	86.49% <97.77%> (-0.01%)	⬇️

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[CodingOnStar]

#35456
#35548