feat: upgrade ai package to version six and the corresponding @ai-sdk/* packages to compatible versions (#18172)

Used the migration guide to carry out this upgrade:
https://ai-sdk.dev/docs/migration-guides/migration-guide-6-0

I have not been able to test locally due to credits.

<img width="220" height="450" alt="image"
src="https://github.com/user-attachments/assets/050b34b9-3239-4010-8c47-b43d44571994"
/>

---------

Co-authored-by: Félix Malfait <felix.malfait@gmail.com>

packages/twenty-server/src/engine/api/mcp/services/mcp-protocol.service.ts

@@ -158,7 +158,7 @@ export class McpProtocolService {
           preloadedTools,
           MCP_EXCLUDED_TOOLS,
         ),
-        inputSchema: zodSchema(executeToolInputSchema),
+        inputSchema: executeToolInputSchema,
       },
       [LOAD_SKILL_TOOL_NAME]: {
         ...createLoadSkillTool((names) =>