[Bug]: PostHog integration always pass random distinct_id

[Yshayy]

What happened?

When integrating PostHog, the Helicone-User-Id should serve as the distinct_id (or at least, should be configurable) as distinct_id use to define the identity linked to the event.
The current behavior create lots of identities/persons entities in PostHog.

Reference:
https://posthog.com/tutorials/api-capture-events
From the basic example:

# curl
curl -v -L --header "Content-Type: application/json" -d '{
    "api_key": "phc_6diyp44WAiUJmihs6aqexBb8jPp5TivvPVu02hXlpcC",
    "event": "request",
    "distinct_id": "ian@posthog.com"
}' https://us.i.posthog.com/capture/

Relevant log output

No response

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@Yshayy