Refactor DI for simplicity and type safety

This commit improves the dependency injection mechanism by introducing a
custom `injectKey` function.

Key improvements are:

- Enforced type consistency during dependency registration and
  instantiation.
- Simplified injection process, abstracting away the complexity with a
  uniform API, regardless of the dependency's lifetime.
- Eliminated the possibility of `undefined` returns during dependency
  injection, promoting fail-fast behavior.
- Removed the necessity for type casting to `symbol` for injection keys
  in unit tests by using existing types.
- Consalidated imports, combining keys and injection functions in one
  `import` statement.

tests/unit/presentation/components/Scripts/View/TheScriptsView.spec.ts

@@ -406,11 +406,11 @@ function mountComponent(options?: {
   return shallowMount(TheScriptsView, {
     global: {
       provide: {
-        [InjectionKeys.useCollectionState as symbol]:
+        [InjectionKeys.useCollectionState.key]:
           () => options?.useCollectionState ?? new UseCollectionStateStub().get(),
-        [InjectionKeys.useApplication as symbol]:
+        [InjectionKeys.useApplication.key]:
           new UseApplicationStub().get(),
-        [InjectionKeys.useAutoUnsubscribedEvents as symbol]:
+        [InjectionKeys.useAutoUnsubscribedEvents.key]:
           () => new UseAutoUnsubscribedEventsStub().get(),
       },
     },