chore: fix linter

[tbruyelle]

• fix govgen import path in gci tool configuration in the .golangci.yml file
• fix import order in respect of that configuration (make format can do that automatically)
• fix usage of //nolint: unparam

Not sure if we should target feat/custom-gov-module or main branch, give me your though!

[giunatale]

@tbruyelle let's target main, I think it makes sense especially as we are approaching merging also the gov modifications.

[giunatale]

Either way, main or feature branch, we soon enough will upstream these changes so it doesn't really makes that much diff.

I am thinking main, but tbh it's really the same.

[tbruyelle]

Thinking about it, even if we target main, we still need a linter PR for the feature branch, for the gov module we've added. So let's merge it there.

[giunatale]

Thinking about it, even if we target main', we still need a linter PR for the feature branch, for the gov' module we've added. So let's merge it there.

makes a lot of sense!
LGTM