Re-enable wastedassign lint

[jsha]

Right now, the wastedassign lint in golangci-lint gives this error:

WARN [linters context] wastedassign is disabled because of go1.18. You can track the evolution of the go1.18 support by following the https://github.com/golangci/golangci-lint/issues/2649.

We should disable it for now to be clear we are not getting its benefit, and re-enable it once golangci-lint fixes it for use under go1.18.

[aarongable]

(Update: wastedassign still does not support generics. You can track golangci-lint's progress on fixing various sub-linters here: golangci/golangci-lint#2649)

[aarongable]

According to this bug, wastedassign now works with generics. But when I re-enable it in our golangci.yml, it prints the message "WARN [linters_context] wastedassign is disabled because of generics.". So I guess we're still waiting on a new release of golangci-lint to enable it.