update devspaces-samples projects when releasing DS to force-push a `latest` tag w/ the latest release

In order to have a stable URL from which to pull the latest stable devfiles (from https://www.eclipse.org/che/getting-started/) instead of a URL that changes with every DS release, we might want to consider having a `latest` tag force-pushed every time we release DS 3.y.

Process would be something like:

• tag repos for 3.4 release with https://github.com/redhat-developer/devspaces/blob/devspaces-3.3-rhel-8/product/tagRelease.sh
• locally, tag the devspaces-3.4-rhel-8 branch as "latest" tag
• force push changes to remote latest tag so it's effectively a floating tag for the new 3.yy stable version

Then we could:

• update https://github.com/eclipse-che/che-website/pull/76 to refer to the latest "latest" tag instead of having to update it every 6 weeks to a new 3.y branch

See also https://github.com/eclipse/che/issues/21924