Send add on name for duo enterprise in-app trials
What does this MR do and why?
Send add on name for duo enterprise in-app trials
- CDOT needs this param to know what type of add on needs applied see https://gitlab.com/gitlab-org/gitlab/-/issues/482830#note_2141288223
- see https://gitlab.com/gitlab-org/gitlab/-/issues/468050 for where this should have been applied originally in some way.
MR acceptance checklist
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Related to #468050