Fully convert ExtensionDiscovery to be injectable

- To fix unit tests

Signed-off-by: Sebastian Malton <sebastian@malton.name>

packages/core/src/common/utils/sync-box/sync-box-injection-token.ts

@@ -5,8 +5,8 @@
 import { getInjectionToken } from "@ogre-tools/injectable";
 import type { IComputedValue } from "mobx";
 export interface SyncBox<Value> {
-  id: string;
-  value: IComputedValue<Value>;
+  readonly id: string;
+  readonly value: IComputedValue<Value>;
   set: (value: Value) => void;
 }