Update trial alerts for Combined trials
What does this MR do and why?
Update the trial success messages for combined trials.
MR acceptance checklist
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Screenshots or screen recordings
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| Before | After |
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How to set up and validate locally
- In rails console enable the experiment fully
Feature.enable(:duo_enterprise_trials) - Login as a user
- Create a new group
- Signup for a new trial using that group
- Confirm change in messaging as per above screen shots
Related to #468027