Change pending badge and text on members page for awaiting members

What does this MR do and why?

• Changes the Pending owner approval text on awaiting users in the Invited tab to Pending owner action
• Adds helpful subtext for users who can manage members on the top-level group(namespace)

See spec on https://gitlab.com/gitlab-org/gitlab/-/issues/361373

Screenshots or screen recordings

before	after

How to set up and validate locally

1. Simulate SaaS and restart GDK
2. Update Application Setting

   bin/rails c
   ApplicationSetting.first.update(check_namespace_plan: true)

3. Disable the feature flag

   Feature.disable(:free_user_cap)

4. Create a new group.
5. Add at least 6 members by username.
6. Open rails console via bundle exec rails c and change last member's state to awaiting

   member = Member.last
   member.update_column(:state, 1)

7. Enable the feature flag

   Feature.enable(:free_user_cap)

8. Refresh the group members page you are on.
9. Notice the changed text and the badge name on the invited tab for your 6th member.
10. Repeat similar process for projects that have groups.

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 #361373