Remove the experimental unified diff

[mrubens]

At this point I think we should just focus our efforts on making the multi-diff great.

---

Important

Remove experimental unified diff feature, focusing on multi-diff strategy across codebase.

• Behavior:
  • Removed experimentalDiffStrategy from experiments in roo-code-defaults.ts and roo-code.ts.
  • Updated getDiffStrategy in DiffStrategy.ts to always use MultiSearchReplaceDiffStrategy.
• Tests:
  • Removed references to experimentalDiffStrategy in ClineProvider.test.ts and experiments.test.ts.
• Settings:
  • Removed experimentalDiffStrategy handling in webviewMessageHandler.ts and AdvancedSettings.tsx.
  • Updated SettingsView.tsx to remove setExperimentEnabled for experimentalDiffStrategy.
• Schemas and Types:
  • Removed experimentalDiffStrategy from experiments.ts, index.ts, roo-code.d.ts, and types.ts.

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🦋 Changeset detected

Latest commit: 78fef79

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

This PR includes changesets to release 1 package

Name	Type
roo-cline	Patch

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