Fix log message flow

[andyw8]

Addresses https://github.com/Shopify/ruby-lsp-rails/pull/517/files#r1834925776

[vinistock]

This is still not 100% correct. We can only return a response back if the server received a request and not a notification.

We may need to start including what each message is as part of their name, so that we can handle errors appropriately in the server. For example, something like:

def process_request(...)
  case request
  when "request/association_target_location"
  end
rescue => e
  if request.start_with?("request")
    send_message({ error: e.full_message })
  end
end