Remove redundant js-timeago-pending from user activity log

What does this MR do?

Enables the skip_js feature of time_ago_with_tooltip() since the frontend was already re-initializing timeago on all the elements after it received the data from the backend.

Are there points in the code the reviewer needs to double check?

Shouldn't be

Why was this MR needed?

• Reduces bandwidth usage (Reduced by ~3.1kb)
• Removes redundant code
• Happy DOM 🎈

What are the relevant issue numbers?

Closes #21063 (closed)

Screenshots (if relevant)

Before (DOM):

After (DOM):

Before (Bandwidth):

After (Bandwidth):

Does this MR meet the acceptance criteria?

• CHANGELOG entry added
• Tests
  • All builds are passing
• Conform by the style guides
• Branch has no merge conflicts with master (if you do - rebase it please)
• Squashed related commits together