chore: refactor vertex text model configurations
What does this merge request do and why?
Refactor vertex text model configurations.
- Conform to PEP variable naming
- Use parameterised tests
This MR incorporated suggestions from !698 (merged).
How to set up and validate locally
Numbered steps to set up and validate the change are strongly suggested.
Merge request checklist
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Tests added for new functionality. If not, please raise an issue to follow up. -
Documentation added/updated, if needed.