Fix sse streaming function call error with agentops

[areibman]

📥 Pull Request

📘 Description
Fixes a TypeError (can only concatenate str (not "NoneType") to str) that occurred when AgentOps instrumented Google ADK run_async calls with streaming_mode="sse" and response_modalities=["TEXT"], and the LLM response included non-text parts (e.g., function calls). The issue was caused by None values from these non-text parts being passed to string concatenation. The fix adds defensive checks to ensure only valid text is processed.

🧪 Testing
A new example (agentops/examples/google_adk/sse_text_function_call.py) was created to reproduce the reported scenario. Manual testing was performed by running this example, confirming that the TypeError no longer occurs and that streaming events (including function calls and responses) are processed correctly. Automated tests were not run in the current environment.

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✅ All modified and coverable lines are covered by tests.

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