Migrate Human in the Loop to Haystack main

[sjrl]

We have an early discussion next week to clarify the timeline for bringing Human in the Loop to the platform. As of now it looks like no additional changes are needed by Haystack to enable this feature in platform.

We could consider leaving BreakpointConfirmationStrategy in experimental since it's not currently needed for platform and is still the more un-tested strategy. I.e. We don't have an end-to-end example working yet with Hayhooks.

Steps for Moving an Experiment to Haystack Core or Integrations

• Make sure the latest Haystack release or an integration release contains the merged experiment
• Update import statements in example cookbook, remove experimental tag from cookbook, etc.
• Close discussion in haystack-experimental with move information
• Remove pydocs
• Move experiment from active experiments in the catalog in haystack-experimental README.md to adopted experiments
• Remove example notebook from haystack-experimental if it exists
• Remove dependencies needed for the experiment from pyproject.toml