feat: sort workspaces (#8770)

## Summary

Sort workspaces so that the personal workspace appears first, followed
by the rest in ascending order (oldest first) by created_at / joined_at.

## Changes

- **What**: teamWorkspaceStore.ts, teamWorkspaceStore.test.ts
- **Breaking**: <!-- Any breaking changes (if none, remove this line)
-->
- **Dependencies**: <!-- New dependencies (if none, remove this line)
-->

src/platform/workspace/api/workspaceApi.ts

@@ -11,6 +11,8 @@ interface Workspace {
   id: string
   name: string
   type: WorkspaceType
+  created_at: string
+  joined_at: string
 }
 
 export interface WorkspaceWithRole extends Workspace {