Add spec file for telemetry events
What does this MR do and why?
Adds a test file for the telemetry usage.
MR acceptance checklist
Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.
Screenshots or screen recordings
No visual change
How to set up and validate locally
yarn test spec/frontend/vue_merge_request_widget/components/widget/telemetry_spec.js
Related to #438945 (closed)