refactor(lint): add flake8-return rules

[onerandomusername]

Summary

Enable all RET errors on ruff.

As some of these error codes might not be desired, I seperated each of them into an individual commit (except for RET506, I fixed some of that in RET505 inadvertently).

Checklist

• [ ] If code changes were made, then they have been tested
  • [ ] I have updated the documentation to reflect the changes
  • [x] I have formatted the code properly by running pdm lint
  • [ ] I have type-checked the code by running pdm run pyright
• [ ] This PR fixes an issue
• [ ] This PR adds something new (e.g. new method or parameters)
• [ ] This PR is a breaking change (e.g. methods or parameters removed/renamed)
• [ ] This PR is not a code change (e.g. documentation, README, ...)

[shiftinv]

@onerandomusername would you mind updating and resolving conflicts?