Remove old cards in What's New

[jellybean2004]

Description

Updated the logic to only include the messages for the latest release if the flag is set to only_recent.

Fixes #3985

How Has This Been Tested?

Manually tested in the build.

Review Checklist:

Documentation

• There is nothing that needs documenting
• Documentation changes are in this PR
• There is an issue open for the documentation (link?)

Installers

• There is a chance this will affect the installers, if so
  • Windows installer (GH artifact) has been tested (installed and worked)
  • MacOSX installer (GH artifact) has been tested (installed and worked)
  • Wheels installer (GH artifact) has been tested (installed and worked)

Licensing

• The introduced changes comply with SasView license (BSD 3-Clause)

[DrPaulSharp]

Ok, a few things here:

• The What's New menu is no longer displayed when starting SasView
• The arrows and page numbers are missing (does this branch need rebasing?)
• Whilst we're here, the "Send to Data Explorer" page needs to be updated to "Freeze Datasets", as do all of the recent screenshots (sorry about that!)
• When accessing "What's New" from the help, I'm finding the pages going back to version 6.0.0 - is this intended?

[jellybean2004]

Ok, a few things here:

• The What's New menu is no longer displayed when starting SasView
• The arrows and page numbers are missing (does this branch need rebasing?)
• Whilst we're here, the "Send to Data Explorer" page needs to be updated to "Freeze Datasets", as do all of the recent screenshots (sorry about that!)
• When accessing "What's New" from the help, I'm finding the pages going back to version 6.0.0 - is this intended?

Thanks for the feedback @DrPaulSharp.

#4035 was merged into main. Since it is technically not a 6.2.0 bug fix, I did not put it in the release.

This PR is based on the release branch to test that only 6.2.0 messages are displayed

I'll have a look at the other points.