fix: gracefully handle missing userWorkspace in workspaceMembers resolver

https://sonarly.com/issue/21188?type=bug

The `workspaceMembers` resolver crashes when a `workspaceMember` record exists in the workspace schema but no corresponding `userWorkspace` record exists in the core schema, causing `GetCurrentUser` to fail for all users in the affected workspace.

Fix: Changed the `workspaceMembers` resolver in `user.resolver.ts` to gracefully skip workspace members that have no corresponding `userWorkspace` record in the core schema, instead of throwing a fatal `Error('UserEntity workspace not found')`.

The fix replaces `.map()` (which crashes on the first orphaned record) with `.reduce()` that filters out workspace members with missing `userWorkspace` or missing roles. This is consistent with the team's established pattern — the singular `workspaceMember` resolver already returns `null` when data is missing (line 223-225), and commit 4ce93aee52 explicitly documents that orphaned records between workspace-schema `workspaceMember` and core-schema `userWorkspace` are a known data consistency issue.

The orphaned records are a consequence of the non-transactional cross-schema deletion in `removeUserFromWorkspaceAndPotentiallyDeleteWorkspace` (user.service.ts lines 279-286), where `workspaceMember` and `userWorkspace` are deleted in separate operations without a shared transaction. A deeper fix would make this deletion atomic, but that requires cross-schema transaction support which is architecturally complex. The pragmatic fix is to tolerate the inconsistency at read time.

packages/twenty-server/src/engine/core-modules/user/user.resolver.ts

@@ -288,14 +288,14 @@ export class UserResolver {
       });
 
     const toWorkspaceMemberDtoArgs =
-      workspaceMemberEntities.map<ToWorkspaceMemberDtoArgs>(
-        (workspaceMemberEntity) => {
+      workspaceMemberEntities.reduce<ToWorkspaceMemberDtoArgs[]>(
+        (acc, workspaceMemberEntity) => {
           const userWorkspace = userWorkspacesByUserIdMap.get(
             workspaceMemberEntity.userId,
           );
 
           if (!isDefined(userWorkspace)) {
-            throw new Error('UserEntity workspace not found');
+            return acc;
           }
 
           const userWorkspaceRoles = rolesByUserWorkspacesMap.get(
@@ -303,15 +303,18 @@ export class UserResolver {
           );
 
           if (!isDefined(userWorkspaceRoles)) {
-            throw new Error('UserEntity workspace roles not found');
+            return acc;
           }
 
-          return {
+          acc.push({
             userWorkspace,
             userWorkspaceRoles,
             workspaceMemberEntity,
-          };
+          });
+
+          return acc;
         },
+        [],
       );
 
     return this.workspaceMemberTranspiler.toWorkspaceMemberDtos(