This continues the work in #20382 and #25835.

To test this I ran ./sage -t --optional=sage,gap_packages,database_cremona_ellcurve $( git diff --name-only HEAD~2 ).

Next steps in getting rid of is_package_installed etc.:

• sage.doctest.control: Replace use of sage.misc.package.list_packages #30746 sage.doctest.control: Replace use of sage.misc.package.list_packages
• Deprecate sage.misc.package functions standard_packages, optional_packages, experimental_packages #30747 Deprecate all of sage.misc.package except for PackageNotFoundError

CC: @tscrim @kiwifb @mkoeppe

Component: build

Author: Timo Kaufmann, Jeroen Demeyer, Antonio Rojas

Branch/Commit: 9c2dcb5

Reviewer: Julian Rüth, Matthias Koeppe

Issue created by migration from https://trac.sagemath.org/ticket/25825