Make usage of Scorers with create experiment endpoint API clearer

[ckazz]

Path: /api-reference/experiment/create-experiment

Reported issue:

According to the Galileo API reference, the Create Experiment endpoint indicates that scorers can be included in the request body:
https://v2docs.galileo.ai/api-reference/experiment/create-experiment#body-scorers
However, when I tried creating an experiment with scorers included at creation time, it didn’t work. What did work instead was:

1. Create the experiment without scorers
2. Enable metrics afterward using Update Metric Settings:
   https://v2docs.galileo.ai/api-reference/experiment/update-metric-settings
   Wanted to flag this in case the docs need updating to match current behavior, or there’s a bug if scorers are intended to be supported during experiment creation.

Looking further into this, documentation can be improved to include and point out the following:

• scorers can be included in the request body at creation time given following are true:
  • trigger=true + prompt_template_version_id has a value provided for it. This is not clear with current documentation.
• The Create Experiment endpoint accepts a scorers field in its request body, but scorers are silently ignored server-side when trigger=false (the default scenario).