Standardize the code of workflow use cases (#495)

.changeset/kind-mice-repair.md

...gents/python/deep_research/app/workflows/deep_research.py

...python/financial_report/app/workflows/financial_report.py

.../agents/python/form_filling/app/workflows/form_filling.py

...omponents/multiagent/python/app/api/callbacks/__init__.py

...es/components/multiagent/python/app/api/callbacks/base.py

...ponents/multiagent/python/app/api/callbacks/llamacloud.py

...ents/multiagent/python/app/api/callbacks/next_question.py

...nts/multiagent/python/app/api/callbacks/stream_handler.py

...ates/components/multiagent/python/app/api/routers/chat.py

...ents/multiagent/python/app/api/routers/vercel_response.py

...lates/components/multiagent/python/app/workflows/tools.py