ref PLG-153
- Scoped one-time payments (`donation_event`) under the "payments"
category in the member activity feed filter.
- Updated `toggleEventType` logic to ensure that toggling "payments"
also toggles one-time payments when the `tipsAndDonations` feature is
enabled.
- Refactored event type handling into utility functions for easier
testing.
- Added unit tests for the new utility functions to ensure correct
behaviour.
- Added acceptance testing.
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