Notify Admin re: the hierarchy limits in displaying Group(s) statistics

What does this MR do and why?

This MR adds copy to inform the user re: how statistics for the root group is calculated (i.e., it does not include sub-groups/projects data). Two lines are added for storage and for members.

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Before After
Screenshot_2024-06-12_at_09.32.59 Screenshot_2024-06-25_at_15.48.30
Screenshot_2024-06-25_at_16.26.16 same

How to set up and validate locally

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

Related to #30004 (closed)

Edited by Angelo Gulina

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