Adds command line modal to the code task in get started

What does this MR do and why?

• adds the last part of the feature: command line instructions
• add tracking
• see https://gitlab.com/gitlab-org/gitlab/-/issues/556427

Changelog: other EE: true

Screenshots or screen recordings

note The screenshots and text in the issue are out of date from the Figma SSOT: https://www.figma.com/design/BIBQ28gmn2wExOFg5HInWQ/Improvements-to-Get-Started--Learn-GitLab-?node-id=163-19210&p=f&t=8K6b13Q8QRz9eSfq-0

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Before	After
N/A
N/A

copy/paste with https

How to set up and validate locally

Note: This is covered by feature spec in this MR and jest as much as possible.

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1. Setup gdk to simulate SaaS - https://docs.gitlab.com/ee/development/ee_features.html#simulate-a-saas-instance and restart GDK
2. Create a new group and project.
3. In rails console, onboard that group that was just created

   ::Onboarding::Progress.onboard(Group.last)

4. In the gitlab admin UI, edit the group to be on an ultimate trial plan(edit button from http://gdk.test:3000/admin/groups)
5. In rails console(bundle exec rails c), change the trial, trial start and end date for the group

   Group.last.gitlab_subscription.update_columns(trial_starts_on: Date.today, trial_ends_on: 30.days.from_now, trial: true)

6. Go to the get started path for the group/project: For instance, http://gdk.test:3000/logan225-group/logan225-project/-/get_started
7. To observe/test the copy functionality, you'll need to enable nginx/https on GDK - see https://gitlab-org.gitlab.io/gitlab-development-kit/howto/nginx/

MR acceptance checklist

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Related to #556427