Add Sage and Oscar code snippets for Galois groups

[rvisser7]

This PR adds more code snippets in Sage and Oscar for Galois groups. Also updated the Magma/Sage/Oscar sidebar download links to use all the code snippets (thereby updating the snippet tests to check all the generated code snippets).

Comments/feedback very welcome! :)

E.g. Galois group 4T2
https://beta.lmfdb.org/GaloisGroup/4T2
http://localhost:37777/GaloisGroup/4T2

E.g. Galois group 11T5
https://beta.lmfdb.org/GaloisGroup/11T5
http://localhost:37777/GaloisGroup/11T5

[roed314]

There are merge conflicts now. Maybe it's better to not show the specific id in the deprecation warning, but use ... instead.

[rvisser7]

Thanks, I've resolved the merge conflicts. I've also just submitted the PR #6887 which now finally updates the Sage command for Galois group :).

I agree we could have a look at modifying the code that generates the code snippet logs to avoid logging the specific ids (which changes every time we regenerate the snippet logs). Merging PR #6887 should resolve this in any case.

That said, perhaps it's not the worst idea to have these id annoyances, as that way it will hopefully encourage people to actually fix the underlying code snippets and eliminate the deprecation warnings altogether. 🙂

[roed314]

Oops, I think merging #6887 means this has merge conflicts again....

[rvisser7]

No worries, conflicts have now been resolved (accepted all incoming changes)! Fortunately, now that #6887 has been merged, should this hopefully be the last time we'll have to resolve any DeprecationWarning id conflicts for these Sage snippet log files (at least for the Galois group snippet). 🙂