Resolve "Redesign group overview UI: MVC"

What does this MR do?

Refreshes group overview to match project overview

• Avatar, group name, and group description now left-aligned
• Notification setting and "New project" CTA right-aligned with group avatar and name
• Leave group / request access now a link next to the 'Group' label below the group name
• Notification setting label removed in favor of icons
  • Tooltip added to indicate notification setting
• Search option moved inside table header next to "Sort by"

Screenshots

Before	After

What are the relevant issue numbers?

#53104 (closed)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• Tests added for this feature/bug
• Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• Security reports checked/validated by reviewer

Closes #53104 (closed)