fix(langchain): don't record tool call output if not include_prompt / should_send_default_pii

[shellmayr]

• This PR makes sure we don't record tool calls as outputs in gen_ai.chat spans in langchain when users deselect the option to include prompts / send pii

Closes TET-1181

[linear]

TET-1179 Langgraph missing execute tool spans

[codecov]

✅ All tests passed in 2567.23s

[linear]

TET-1181 Langchain missing input output on execute_tool span

[alexander-alderman-webb]

My one concern is that I have not heard tool arguments referred to as "prompts". Would users be confused if setting include_prompts=False also hides data from the tool calls?

We could consider more granular setting, especially since I am unsure how intuitive it is for tool call input and outputs to fall under the "prompt" umbrella.

But if that's more niche than we want to cater for, this looks good to go.