(from #29901)

... for packages like database_stein_watkins and polytopes_db_4d

Parts of sage_bootstrap know about this package type, but other scripts don't.

Our GH Actions scripts filter out these packages by name. This can be refactored.

With the present ticket, we can now say sage --package list :optional: :experimental: --no-file huge to filter out the huge packages.

Huge packages are now marked by the presence of the file huge; so this is actually orthogonal to the package type.

We also add files named has_nonfree_dependencies to some other packages so that they can be filtered out by the same mechanism.

CC: @jhpalmieri @dimpase @orlitzky @seblabbe @Etn40ff @tobiasdiez

Component: build

Author: Matthias Koeppe

Branch/Commit: 15cc20c

Reviewer: John Palmieri

Issue created by migration from https://trac.sagemath.org/ticket/29919