Refactor simplybook therapy webhook

[annarhughes]

What changes did you make?

Refactored simplybook therapy webhook functions to include more logs and more safety checks.

Changes include:

• client_id refactored to user_id for clarity
• improved logging to make it clear where/why the error happened in future
• ensured cancelled therapy reimburses the correct partner admin
• case insensitive email filtering where: `"clientEmail" ILIKE '[email protected]' to prevent user matching errors
• ensured fallback logic to match user to client_email or user_id is working, should solve all recent related errors

Why did you make the changes?

There have been several errors related to user not being found, likely due to case matching user.email with storyblok client_email