chore(util): get eventDefinitions directly

[pinussilvestrus]

Which issue does this PR address?

Prevent unwanted side effects by overriding to an empty array.

Related to https://github.com/camunda/camunda-modeler-plugins/issues/35

Acceptance Criteria

• [ ] Corresponds to the concept
• [ ] Corresponds to the design

Definition of Done

• [ ] corresponds to the design principles
• [ ] corresponds to the code standards
• [ ] passes Continuous Integration checks
• [ ] available as feature branch on GitHub
  • [ ] contains the cleaned up commit history
  • [ ] commit messages satisfy our commit message guidelines
  • [ ] a single commit closes the issue via Closes #issuenr