Many old download pages should (probably) be removed

Summary

The release pages for old milestones + release candidates for the IDE still exist and are linked to starting with https://www.eclipse.org/downloads/packages/ page

Steps to reproduce

1. Start at https://www.eclipse.org/downloads/packages/ or any of the pages with this box and click "Older versions":
2. Click on any of the versions (other than 2022-09 as that is under development still) and you are presented with a list of possible pages:
3. Click on (e.g.) M3 Packages: https://www.eclipse.org/downloads/packages/release/2022-06/m3
4. Click on any of the download links:

What is the current bug behavior?

This error: Eclipse downloads - file unavailable The selected file is invalid, or it is no longer available for download.

What is the correct behavior?

For pages like https://www.eclipse.org/downloads/packages/release/2022-06 to have only R packages in them (perhaps auto-redirect to the /r subdir). Note that older releases (<= Oxygen) have multiple valid subpages, e.g. R, 1A, 2, etc.