Clarify ADK + LiteLLM integration to prevent duplicate trace confusion

[devin-ai-integration]

Problem

Users are experiencing duplicate traces when using ADK + LiteLLM integration, causing confusion about proper setup.

Files to Update

• docs/v2/examples/google_adk.mdx
• docs/v2/integrations/google_adk.mdx

Changes Needed

• Document how AgentOps ADK instrumentor prevents duplicate spans
• Add troubleshooting section for duplicate trace issues
• Clarify proper setup patterns to avoid duplicates
• Explain the relationship between ADK's telemetry and AgentOps instrumentation

Context

The ADK instrumentor specifically disables ADK's built-in telemetry to prevent duplicates, but this isn't clearly documented for users.

Assignee

Please assign to Dwij when creating