refactor(core): refactor atom to use di (#5831)

To support multiple instances, this PR removes some atoms and implements them using the new DI system.

removed atom

- `pageSettingsAtom`
- `currentPageIdAtom`
- `currentModeAtom`

packages/frontend/core/src/testing.ts

@@ -37,7 +37,7 @@ export async function configureTestingEnvironment() {
 
   await workspace.engine.sync.waitForSynced();
 
-  const { page } = workspace.services.get(PageManager).openByPageId('page0');
+  const { page } = workspace.services.get(PageManager).open('page0');
 
   rootServices.get(CurrentWorkspaceService).openWorkspace(workspace);
   workspace.services.get(CurrentPageService).openPage(page);