Change Update button to Contact sales

What does this MR do and why?

When a user is active in a trial we believe we can increase the conversion rate by allowing the user to quickly connect with a salesperson from their trial status widget by swapping one of the available CTAs.

Screenshots or screen recordings

Before:	After:

How to set up and validate locally

1. Enable group_contact_sales feature flag.
2. Create new user.
3. Go to http://localhost:3000/-/trials/new and activate trial
4. Open any group show page.

Related to https://gitlab.com/gitlab-org/gitlab/-/issues/348345