gh-37789: various ruff fixes in groups (PERF, etc)
This fixes various suggestions of `ruff` in the `groups` folder, mostly
about `PERF` code
### :memo: Checklist
- [x] The title is concise and informative.
- [x] The description explains in detail what this PR is about.
URL: https://github.com/sagemath/sage/pull/37789
Reported by: Frédéric Chapoton
Reviewer(s): gmou3
