Migrate beta badges to Pajamas::ExperimentBadgeComponent

What does this MR do and why?

MR !214511 (merged) created Pajamas::ExperimentBadgeComponent a Rails ViewComponent equivalent to the GitLab UI GlExperimentBadge component.

This MR migrates the 2 remaining instances that used the shared/beta_badge partial to use the new design system component.

Changes:

• ee/app/views/groups/settings/_remove_dormant_members.html.haml - Migrated to Pajamas::ExperimentBadgeComponent with custom styling preserved
• ee/app/views/groups/virtual_registries/index.html.haml - Migrated to Pajamas::ExperimentBadgeComponent

Both instances now use the default bottom popover placement (the old partial hardcoded top placement but did not seem to work).

Changelog: changed

EE: true

References

Part of gitlab-org/gitlab-services/design.gitlab.com#3213

Closes gitlab-org/gitlab-services/design.gitlab.com#3215 (closed)

Screenshots or screen recordings

Before	After

How to set up and validate locally

1. Simulate a SaaS instance
2. Navigate to Group > Settings > General
3. Scroll to the dormant members setting
4. Turn off simulate a saas instance so you don't get confused next MR review

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1. Navigate to Group > Deploy > Virtual registry
2. Scroll to the virtual registry heading

MR acceptance checklist

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