Rename "Deleted projects" tab to "Pending deletion"

What does this MR do and why?

Update the text as it was a bit misleading because all projects pending deletion will appear on this page regardless of who removed them.

Screenshots or screen recordings

How to set up and validate locally

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

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Relates to #347468 (closed)