Move gap packages to features

[timokau]

Split from #25825. This moves the remaining instances of is_package_installed for gap packages to Features.

CC: @tscrim @jdemeyer

Component: build

Author: Timo Kaufmann

Branch/Commit: 63363f0

Reviewer: Travis Scrimshaw

Issue created by migration from https://trac.sagemath.org/ticket/25835

[tscrim]

comment:3

You will also want to include #22623 (looking at this ticket, I think I did a poor job of actually testing if GAP could load the QuaGroup package on #22623 as I just let it fail).

[timokau]

comment:4

You probably know your code best. Could you maybe make that addition? Feel free to base off my branch and rebase as you like.

[tscrim]

Changed branch from u/gh-timokau/gap-features to u/tscrim/gap_features-25835

[tscrim]

comment:5

Let me know if I did this correctly. If so, then you can set this to a positive review.

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New commits:

edc7141	Merge branch 'u/gh-timokau/gap-features' of git://trac.sagemath.org/sage into u/tscrim/gap_features-25835
63363f0	Adding GapPackage to quantum_group_gap.py.

[tscrim]

Reviewer: Travis Scrimshaw

[tscrim]

Changed commit from 34aebef to 63363f0