Resolves #3300

I only disabled the toolchain switching if the version is not system. I did this because system is the default if go is installed globally and no language_version is explicitly specified. In this case users likely doesn't care which version of go is used as long as their hooks are working, so I think it makes more sense to allow the toolchain switching since it doesn't break user expectations and other than a small performance hit on hook installation doesn't have negative impact.

If we were to disable toolchain switching regardless of the version, many hooks would break since many environments lag with their go version. For example, in GitHub-hosted runners for GitHub Actions the pre-installed go version is 1.21 which is two versions behind the current version, so it's likely that a lot of hooks work thanks to automatic toolchain switching without even knowing.