[tahoe-lafs-trac-stream] [Tahoe-LAFS] #4015: Improve linting coverage

[Tahoe-LAFS]

#4015: Improve linting coverage
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 Reporter:  itamarst     |          Owner:  itamarst
     Type:  enhancement  |         Status:  new
 Priority:  normal       |      Milestone:  undecided
Component:  unknown      |        Version:  n/a
 Keywords:               |  Launchpad Bug:
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 Follow-up to #4014. There are many more lints that would help catch real
 bugs, and with ruff there is no meaningful impact on checking time.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4015>
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