Fix performance regression in AllHomomorphismClasses
and possibly other code searching isomorphisms
#5032
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Since this is costly, it is worth to force a minimal generating set for
solvable groups. This resolves problems the yangbaxter package has had.
Close #5024
This patch is taken from @hulpke's PR #5031, but having different, unrelated improvements and bug fixes on separate PRs reduces the work needed to make GAP releases quite a bit (as it allows us to deal with those PRs in automation, instead of adding them to the list of PRs that need manual work), and is also more convenient for reviewers, so I am splitting it off here.
For reference, here is the motivation for this patch from the description of PR #5024:
This PR addresses this.