chore(server): remove useless client allowGuestDemoWorkspace config (#12988)

#### PR Dependency Tree


* **PR #12988** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Chores**
* Removed the configuration option that allowed guests to access demo
workspaces. This affects related settings in the system configuration
and admin interface.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

.docker/selfhost/schema.json

@@ -597,11 +597,6 @@
           "type": "string",
           "description": "Allowed version range of the app that allowed to access the server. Requires 'client/versionControl.enabled' to be true to take effect.\n@default \">=0.20.0\"",
           "default": ">=0.20.0"
-        },
-        "allowGuestDemoWorkspace": {
-          "type": "boolean",
-          "description": "Allow guests to access demo workspace.\n@default true",
-          "default": true
         }
       }
     },

packages/backend/server/src/core/version/config.ts

@@ -5,7 +5,6 @@ export interface VersionConfig {
     enabled: boolean;
     requiredVersion: string;
   };
-  allowGuestDemoWorkspace?: boolean;
 }
 
 declare global {
@@ -29,8 +28,4 @@ defineModuleConfig('client', {
     desc: "Allowed version range of the app that allowed to access the server. Requires 'client/versionControl.enabled' to be true to take effect.",
     default: '>=0.20.0',
   },
-  allowGuestDemoWorkspace: {
-    desc: 'Allow guests to access demo workspace.',
-    default: true,
-  },
 });

packages/frontend/admin/src/config.json

@@ -211,10 +211,6 @@
     "versionControl.requiredVersion": {
       "type": "String",
       "desc": "Allowed version range of the app that allowed to access the server. Requires 'client/versionControl.enabled' to be true to take effect."
-    },
-    "allowGuestDemoWorkspace": {
-      "type": "Boolean",
-      "desc": "Allow guests to access demo workspace."
     }
   },
   "captcha": {