Fix the spacing between trials title and text

What does this MR do and why?

Fix the spacing between trials title and text

• errantly removed in !173002 (merged) likely due to comparing this page with the /-/trials/duo_pro/new page. The duo pages use flex and have other stylings, so for now this part needs to be different on this page until we further align the UX of these pages...if we do.
• ref: https://gitlab.com/gitlab-org/gitlab/-/issues/500689#note_2226119491
• see https://gitlab.com/gitlab-org/gitlab/-/issues/500689

Changelog: other EE: true

References

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• !173002 (comment 2220624854)

MR acceptance checklist

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Screenshots or screen recordings

Before	After

How to set up and validate locally

1. Setup GDK to simulate SaaS.
2. Visit /-/trials/new.
3. Notice the page.

Related to #500689

ee/app/views/gitlab_subscriptions/trials/duo_enterprise/_lead_form.html.haml

@@ -10,7 +10,7 @@
     .gl-p-7.gl-rounded-lg.gl-bg-white
       = sprite_icon('tanuki-ai', size: 32, css_class: 'gl-pb-3')
 
-      %h2.gl-my-0
+      %h2.gl-mt-0
         - if @group_name.present?
           = safe_format(s_('DuoEnterpriseTrial|Start your free GitLab Duo Enterprise trial on %{group_name}'), group_name: @group_name)
         - else