chore: import upstream snapshot with attribution

tests/integration/fixture/bigquery_agent/README.md

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+# Instructions
+
+## Run Evaluation
+
+1. Set environment variables in your terminal:
+
+  ```shell
+  export GOOGLE_GENAI_USE_ENTERPRISE=FALSE
+  export GOOGLE_API_KEY=<your_api_key>
+  export GOOGLE_CLOUD_PROJECT=<your_bigquery_project>
+  ```
+1. Change to the current directory:
+
+  ```shell
+  cd tests/integration/fixture/bigquery_agent/
+  ```
+1. Customize the evaluation dataset to the environment `GOOGLE_CLOUD_PROJECT`
+   by replacing the placeholder to the real project set in your environment:
+
+  ```shell
+  sed -e "s:\${GOOGLE_CLOUD_PROJECT}:${GOOGLE_CLOUD_PROJECT}:g" simple.test.json -i
+  ```
+1. Run the following command as per https://google.github.io/adk-docs/evaluate/#3-adk-eval-run-evaluations-via-the-cli:
+
+  ```shell
+  adk eval . simple.test.json --config_file_path=test_config.json
+  ```
+
+  If it fails, re-run with `--print_detailed_results` flag to see more details
+  on turn-by-turn evaluation.
+
+## Generate Evaluation dataset
+
+1. Set environment variables in your terminal:
+
+  ```shell
+  export GOOGLE_GENAI_USE_ENTERPRISE=FALSE
+  export GOOGLE_API_KEY=<your_api_key>
+  export GOOGLE_CLOUD_PROJECT=<your_bigquery_project>
+  ```
+1. Set up google [application default credentials](https://cloud.google.com/docs/authentication/provide-credentials-adc)
+   on your machine.
+
+  ```shell
+  gcloud auth application-default login
+  ```
+1. Change to the directory containing agent folder:
+
+  ```shell
+  cd tests/integration/fixture/
+  ```
+1. Run the following command to start the ADK web app:
+
+  ```shell
+  adk web
+  ```
+1. Open the ADK web UI in your browser http://127.0.0.1:8000/dev-ui/?app=bigquery_agent.
+1. Create an evaluation dataset by following [these steps](https://google.github.io/adk-docs/evaluate/#1-adk-web-run-evaluations-via-the-web-ui).
+   This would generate file `bigquery_agent/simple.evalset.json`.
+1. Note that this evaluation data would be tied to the agent interaction in the
+   `GOOGLE_CLOUD_PROJECT` set in your environment. To normalize it by replacing
+   the real project set in your environment to a placeholder, let's run the
+   following command:
+
+  ```shell
+  sed -e "s:${GOOGLE_CLOUD_PROJECT}:\${GOOGLE_CLOUD_PROJECT}:g"  bigquery_agent/simple.evalset.json > bigquery_agent/simple.test.json
+  ```