Adjust Cloudsmith retention limit to have at most ~10k preview packages at all times

[Piedone]

Is your feature request related to a problem? Please describe.

Cloudsmith hosts our preview packages for free. They asked us to reduce the current number of preview packages to ~10k. This is more than 1.5 months of retention, in line with what we have documented.

Describe the solution you'd like

Under https://cloudsmith.io/~orchardcore/repos/preview/lifecycle/, eventually, Limit By Count should be ~50, reducing the total number of packages at a time to about 10k. Make sure that we indeed have 50 versions available for all packages.

Describe alternatives you've considered

We could migrate to a different package hosting solution. However, we went to Cloudsmith for a reason back then. GitHub package hosting is another option. However, there we have a ~25 GB limit for storage and 100 GB for monthly data transfer (see here).

[Piedone]

I'm working on this.

[Piedone]

This is now done. I lowered the number of available versions to 52, so that's at least the last 52 days of preview packages (with at most 1 package a day, that's about 1,5 months' worth of packages).