Remove unlimited members alert

What does this MR do and why?

As part of our Free User limit efforts, we recently implemented additional alerts notifying new users that they can have unlimited members during the trial period. https://gitlab.com/gitlab-org/gitlab/-/issues/376227 tackled adding these in-context alert on the Invite Modal

Immediately after registration, invite modal appears.

Because this is the first experience a user has in the product we want to remove the Add unlimited members with your trial alert from this specific modal

Screenshots or screen recordings

before	after

How to set up and validate locally

Note: Since trials required a valid CustomersDot connection, trials can't be launched easily in a local development environment

For testing locally it's easiest to negate the logic which populates the dataset with the necessary key/json data if a trial is active which will show the alert

!110301 (diffs)

      if !source.root_ancestor.trial_active?
        dataset[:active_trial_dataset] = ::Gitlab::Json.dump(active_trial_dataset(source))
      end

Additional steps:

1. Simulate your GDK as SaaS
2. bin/rails c ApplicationSetting.first.update(dashboard_limit_enabled: true)
3. Sign out. Visit /-/trial_registrations/new. Finish onboarding.
4. Make sure celebration modal doesn't have members alert

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #390851 (closed)