Adds last downloaded date to package registry UI

What does this MR do and why?

Added to the user interface so that users of the Package Registry can see the last time a given package was downloaded.

Screenshots or screen recordings

How to set up and validate locally

1. Follow instructions to publish a new npm package.
2. Visit package details page, confirm that last dowloaded at time is not displayed
3. copy instructions to install package. Make sure .npmrc is updated to fetch package.
4. Create a new test directory & install npm package
5. Visit package details page
6. Confirm last dowloaded at time is displayed

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.

Closes #362393 (closed)