Add tooltip to group intheritance in protected environments

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What does this MR do and why?

This MR adds an icon with a question mark and a tooltip with a text to explain the intention of the group inheritance column to the list for editing approvers in the protected environments list under CI/CD-settings. The same icon and tooltip is added to the modal where approvers are added. The titles has been changed from 'Group inheritance' to 'Enable group inheritance' on both tables.

MR acceptance checklist

Screenshots or screen recordings

Before	After

How to set up and validate locally

1. Go to a project with a protected environment in the gitlab gui.
2. Go to "Settings" and choose "CI/CD".
3. Expand "Protected environments"
4. Click on the protected environment list item
5. Hover over the question mark icon in the edit approver list heading