Allow "golangci-lint is custom built" notification to be disabled

[frankoid]

We install golangci-lint using go install in our Makefiles so I don’t want the plugin to install a different version.

It would be nice if this specific notification could be disabled without disabling any other notifications from the plugin.

I've found the Go linter notifications entry in Preferences | Appearance & Behavior | Notifications but I expect it controls other notifications from the plugin, not just the this one.