[BUG]: Update deprecated Gemini model versions across the repository

[shambhu-hegde]

Multiple files in the repository reference deprecated or soon-to-be-deprecated Gemini model versions. These should be updated to use current, supported models.

Deprecated Models Found:
gemini-2.0-flash-001 (Deprecated)

python/agents/travel-concierge/travel_concierge/agent.py (line 34)
python/agents/RAG/rag/agent.py (line 44)
go/agents/sail-researcher/config/config.go (line 6)
go/agents/sail-researcher/README.md (line 73)
gemini-2.0-flash (Legacy/Deprecated)

python/agents/story_teller/story_teller_agent/agent.py (line 29 - used throughout the file)
python/agents/image-scoring/image_scoring/config.py (line 7)
python/agents/image-scoring/.env.example (line 12)
python/agents/antom-payment/antom-payemnt-agent/agent.py (line 10)
python/agents/hierarchical-workflow-automation/cookie_scheduler_agent/bigquery_utils/BIGQUERY_SETUP.md (line 23)
python/agents/short-movie-agents/GEMINI.md (multiple references)
python/agents/plumber-data-engineering-assistant/plumber_agent/sub_agents/dataproc_template_agent/utils.py (line 81)
Recommended Actions:
Replace gemini-2.0-flash-001 with gemini-2.0-flash (if available) or a newer supported model like gemini-2.5-flash or gemini-3-pro
Replace gemini-2.0-flash with a current supported version (e.g., gemini-2.5-flash or gemini-3-pro)
Update all documentation and examples to use current models
Consider providing migration guidance for users
Files Affected:
python/agents/travel-concierge/travel_concierge/agent.py
python/agents/story_teller/story_teller_agent/agent.py
python/agents/RAG/rag/agent.py
python/agents/image-scoring/image_scoring/config.py
python/agents/image-scoring/.env.example
python/agents/antom-payment/antom-payemnt-agent/agent.py
go/agents/sail-researcher/config/config.go
go/agents/sail-researcher/README.md
python/agents/hierarchical-workflow-automation/cookie_scheduler_agent/bigquery_utils/BIGQUERY_SETUP.md
python/agents/short-movie-agents/GEMINI.md
python/agents/plumber-data-engineering-assistant/plumber_agent/sub_agents/dataproc_template_agent/utils.py
Priority:
High - Deprecated models may stop working or experience degraded performance

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