Add tracking test for change_continuous_onboarding_link_urls experiment
What does this MR do and why?
As part of the GitLab experimentation guidelines, it states that:
Experiments must have corresponding frontend or feature tests to ensure they exist in the application.
That has not yet been done for the change_continuous_onboarding_link_urls
experiment.
In order to fulfill that requirement, we should add a simple, happy-path feature spec which ensures that our experiment is present as part of the flow we expect it to be present in.
Related to #344574 (closed)
Edited by Serhii Yarynovskyi