fix more ruff rule exclusions; ignore BLE001 intentionally

[eviljeff]

Further follow-on work for mozilla/addons#16365

Description

Removes yet more ignored ruff rules, so we're closer to the standard list of ruff formatting/linting rules.

Context

• Like the other follow-up patches, the method is: removing some rules from the ignore list, then asking Claude to fix, then checking the result to see if it makes sense to me. (I tinkered with a few fixes too)
• This time re-enables "SIM115", "RUF059", "SIM102", and "FLY002". That will only leave RUF012 (345 errors) and UP031 (502) that are PR-sized pieces of work on their own - assuming we decide it's worth doing them.
• "BLE001" was also investigated, but the majority of the errors were genuine cases where we wanted to specifically catch all exceptions, so I added it to the set of purposeful ignored rules rather than adding # noqa BLE001 to each occurrence. We can revisit that decision. (The fixes for BLE001 were retained in a few places, where a tighter exception was a good idea - those changes should be sense-checked by the reviewer of this patch too)

Testing

Checklist

• Add #ISSUENUM at the top of your PR to an existing open issue in the mozilla/addons repository.
• Successfully verified the change locally.
• The change is covered by automated tests, or otherwise indicated why doing so is unnecessary/impossible.
• Add before and after screenshots (Only for changes that impact the UI).
• Add or update relevant docs reflecting the changes made.