feat: reduce backend (#14251)

#### PR Dependency Tree


* **PR #14251** 👈

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

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

* **New Features**
* Current user profile now exposes access tokens, revealed tokens, and
detailed calendar accounts/subscriptions.
* Workspace now exposes permissions, calendars, calendar events, and a
workspace-scoped blob upload part URL.
  * New document-update mutation for applying doc updates.

* **API Changes**
  * validateAppConfig is now a query (mutation deprecated).
* Several legacy top-level calendar/blob endpoints deprecated in favor
of user/workspace fields.

* **Refactor**
* Calendar, blob-upload and access-token surfaces reorganized to use
user/workspace-centric fields.

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packages/backend/server/src/__tests__/e2e/notification/resolver.spec.ts

@@ -273,7 +273,7 @@ e2e('should mark notification as read', async t => {
   const count = await app.gql({
     query: notificationCountQuery,
   });
-  t.is(count.currentUser!.notificationCount, 0);
+  t.is(count.currentUser!.notifications.totalCount, 0);
 
   // read again should work
   for (const notification of notifications) {