fix: Patch agent flow to honor agent handler established provider (#3251)

server/utils/agentFlows/executor.js

server/utils/agentFlows/executors/api-call.js

server/utils/agentFlows/executors/llm-instruction.js

server/utils/agentFlows/executors/web-scraping.js

server/utils/agentFlows/index.js

server/utils/agents/aibitat/index.js

server/utils/agents/index.js