Fix apollo cache updating in remote development

What does this MR do and why?

Fix apollo cache updating in remote development

• !105783 (comment 1380471381)
• immer has to mutate the given draftData
• there's no need to write anything if we don't have anything

Screenshots or screen recordings

There should be no visual changes.

How to set up and validate locally

1. Enable the remote development feature flag Feature.enable(:remote_development_feature_flag)
2. You might need to run gdk restart rails-web so rails reconfigure the routes.
3. Open http://gdk.test:3000/-/remote_development/workspaces/create in your Web Browser.
4. If you can make it past the agent validators, you should be able to create a Workspace without any errors in the console.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.