refactor(greenhouse): migrate YamlViewer from @uiw/react-codemirror to native CodeMirror packages

[ArtieReus]

Summary

Refactors the YamlViewer component to use native CodeMirror packages instead of the @uiw/react-codemirror wrapper

Changes Made

• Migrated from @uiw/react-codemirror wrapper to native CodeMirror 6 API
• Separated editor creation and content update logic into distinct effects
• Extracted extensions configuration into createEditorExtensions() function for better organization
• Used ref (initialContentRef) to store initial content and prevent unnecessary effect re-runs

Benefits

• No React version constraint from CodeMirror packages - The native packages are framework-agnostic.
• Smaller bundle size: Removed unnecessary wrapper dependency
• Better performance: Editor instance is now created only once, preserving cursor position, undo history, and scroll position
• More control: Direct access to CodeMirror API allows for more customization
• Consistent theming: Using @codemirror/theme-one-dark for the same dark theme appearance

Related Issues

• #1891

Screenshots (if applicable)

Testing Instructions

1. pnpm i
2. pnpm TASK

Checklist

• I have performed a self-review of my code.
• I have commented my code, particularly in hard-to-understand areas.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.
• I have made corresponding changes to the documentation (if applicable).
• My changes generate no new warnings or errors.
• I have created a changeset for my changes.

PR Manifesto

Review the PR Manifesto for best practises.

[changeset-bot]

🦋 Changeset detected

Latest commit: 7ef50ab

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@cloudoperators/juno-app-greenhouse	Patch

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