Inject state and tool call data into tools

Problem to solve

LangGraph allows tools to inject state and tool call metadata into tools (see https://langchain-ai.github.io/langgraph/how-tos/tool-calling/#short-term-memory), but we're currently not taking advantage of this and instead are manually passing those values around.

Proposal

Migrate to using injected values

Further details

Note that at the moment InjectedToolCallId doesn't play nicely with custom tool input schemas. Follow https://github.com/langchain-ai/langgraph/issues/5072 for more details

Links / references

Internal slack thread with LangChain around the upstream issue