Update ADK doc according to issue #1743 - 3

[adk-bot]

3. Document v_agent_response View in BigQuery Analytics

Doc file: docs/integrations/bigquery-agent-analytics.md

Current state:

| v_agent_starting | agent_instruction (STRING) |
| v_agent_completed | total_ms (INT64) |
| v_invocation_starting | (common columns only) |

Proposed Change:

| v_agent_starting | agent_instruction (STRING) |
| v_agent_completed | total_ms (INT64) |
| v_agent_response | response_text (STRING), source_event_id (STRING), source_event_author (STRING), source_event_branch (STRING) |
| v_invocation_starting | (common columns only) |

Reasoning:
The BigQuery Agent Analytics Plugin now automatically creates a v_agent_response view for the new AGENT_RESPONSE event. This needs to be documented in the auto-created views table.

Reference: src/google/adk/plugins/bigquery_agent_analytics_plugin.py

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