Re-enable select linters after golangci-lint v8.0.0 upgrade

[justaugustus]

ref: #715

[cpanato]

@justaugustus, what is the plan here? Would you be open to receiving one pr per lint re-enable? to make it easier to review

[justaugustus]

@cpanato — yep, one PR per re-enable sounds great!

I've marked all of the areas with TODO comments or //nolints, so they should be easy to identify.
Will assign this to you; thanks in advance for the help!