Fix tooltips on group "Shared projects" view

What does this MR do and why?

Related to #368143 (closed)

This MR updates visibility tooltip text to describe project if item is not group

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

Screenshots are required for UI changes, and strongly recommended for all other merge requests.

Before	After
Screen_Recording_2024-01-10_at_16.29.32	Screen_Recording_2024-01-10_at_16.30.17

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

Prerequisites:

1. Have a group
2. There's a private project in the group
3. There's a private subgroup in the group

Steps to test:

1. Open group page
2. Hover on lock icon near project name
3. Check that text describes project
4. Hover on lock icon near subgroup name
5. Check that text describes group