Fix: Remove deprecated gemini-2.5-pro-exp-03-25 model

[continue]

Summary

This PR removes the deprecated Gemini 2.5 Pro Experimental model (gemini-2.5-pro-exp-03-25) from the codebase.

Root Cause

Google has deprecated the experimental Gemini 2.5 Pro model endpoint (gemini-2.5-pro-exp-03-25). This model is no longer available through the Google Generative AI API, causing 404 errors for users trying to access it.

Changes Made

• Removed gemini-2.5-pro-exp-03-25 from Gemini provider model list (packages/llm-info/src/providers/gemini.ts)
• Removed gemini25ProExp configuration from GUI models list (gui/src/pages/AddNewModel/configs/models.ts)
• Updated VSCode config schema to exclude deprecated model (extensions/vscode/config_schema.json)
• Updated VertexAI provider to remove deprecated model (packages/llm-info/src/providers/vertexai.ts)

Migration Path

Users experiencing this issue should switch to the stable Gemini 2.5 Pro model:

• Use gemini-2.5-pro or gemini-2.5-pro-latest instead
• The stable version has the same capabilities as the experimental one, including the 1M token context window

Related Issue

Fixes #8176

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This agent session was co-authored by bdougieyo and Continue.

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Summary by cubic

Removed the deprecated Gemini 2.5 Pro Experimental model (gemini-2.5-pro-exp-03-25) across providers, GUI, and config to prevent 404s after Google’s deprecation.

• Migration
  • Use gemini-2.5-pro or gemini-2.5-pro-latest instead.
  • These models offer the same capabilities, including the 1M token context window.

[github-actions]

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[cubic-dev-ai]

No issues found across 4 files

[RomneyDa]

This is valid but can we

[sestinj]

🎉 This PR is included in version 1.3.0 🎉

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[sestinj]

🎉 This PR is included in version 1.27.0 🎉

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[sestinj]

🎉 This PR is included in version 1.5.0 🎉

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[sestinj]

🎉 This PR is included in version 1.30.0 🎉

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• GitHub release

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