ref PLG-160
- Refactored donation handling logic to be processed within the
`checkout.session.completed` webhook event.
- Added support for capturing and storing donation messages from Stripe
sessions.
- Integrated donation messages into the email notifications sent to
staff.
- Added database integration.
- Removed redundant donation logic from the invoice.payment_succeeded
webhook, since custom fields isn't supported.
- Updated and added new tests
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Co-authored-by: Sanne de Vries <sannedv@protonmail.com>
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