Doing so has a number of advantages:
- it removes code duplication, thereby improving readability;
- it removes hardcoded editor IDs, by using the `getNextEditorId` helper
function that was previously introduced for the highlight editor
integration tests, thereby improving readability and reusability;
- it removes potential for intermittent failures by not proceeding until
the freetext editor is fully created and all assertions pass, which
didn't happen consistently before because the code wasn't centralized.
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