refactor: move human-in-the-loop guides into provider subdirectories

[GregHolmes]

Description

Just merged the HITL guides, but realised I hadn't placed them in their correct provider directories.
This PR fixes it.

Checklist

• Commits have been rebased.
• Linting has been run against the changed file(s).
• The PR adheres to the writing style guide and contribution guide.

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