Allow users to select either Premium or Ultimate trial
### Problem to solve When a customer wants to trial a Premium plan as opposed to the Ultimate plan, they have to contact support to manually downgrade their trial plan to Premium. ### User experience goal An easy, intuitive way to select the plan they would like to trial ### Proposal Present a selection of trial plans (Ultimate vs Premium) to the customer when they are signing up for a trial. We should potentially also explain the difference and what the customer can expect to get with each plan. Considerations: we would possibly want to ensure that the customer can only trial once, i.e they shouldn't be able to sign up for Premium 30 days and then Ultimate 30 days, getting 60 days free in total. PM to confirm if this should be avoided or if we don't mind a "double trial". We should also consider if we want to allow/enable the customer to be able to change plans during the trial (i.e after the trial has started). This may require a different issue. ### Permissions and Security Only group owners can sign up for a trial on their namespace (SaaS). ### Success Validation Number of [internal requests](https://gitlab.com/gitlab-com/support/internal-requests/-/analytics/issues_analytics?scope=all&utf8=%E2%9C%93&label_name[]=Plan%20Change%20Request) and tickets for changing the trial plan type decreases.
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