Add additional_properties to event definition
What does this MR do and why?
As a first step to add additional_properties
to event definitions as described in #434563, this MR adds support for the new property and migrate a single event definition to the new format.
MR acceptance checklist
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How to set up and validate locally
- Modify an event definition to the new format
- Run
bundle exec rspec ./spec/lib/gitlab/tracking/event_definition_validate_all_spec.rb
to validate the change
Related to #434563
Edited by Jonas Larsen