We add a new GitHub Actions CI workflow tox-optional.yml, which tests most optional packages, using the maximal packages factor.

Depends on #29417
Depends on #29424
Depends on #29426
Depends on #29501
Depends on #29508
Depends on #29510
Depends on #29403

CC: @dimpase @kliem @orlitzky @jhpalmieri

Component: porting

Keywords: ContinuousIntegration

Author: Matthias Koeppe

Branch/Commit: 816477a

Reviewer: Dima Pasechnik

Issue created by migration from https://trac.sagemath.org/ticket/29341