fix(FR-1432): Fix user email conditional rendering and remove Korean comments (#4228)

### Refactor user email rendering in SessionDetailContent and remove TODO comment

### Changes

- Simplified the conditional rendering logic for user email in SessionDetailContent
- Removed a TODO comment in backend.ai-client-esm.ts related to version 25.13.0

**Checklist:** (if applicable)

- [ ] Documentation
- [ ] Minium required manager version
- [ ] Specific setting for review (eg., KB link, endpoint or how to setup)
- [ ] Minimum requirements to check during review
- [ ] Test case(s) to demonstrate the difference of before/after

Author: ironAiken2

react/src/components/SessionDetailContent.tsx

@@ -253,11 +253,9 @@ const SessionDetailContent: React.FC<{
           </Descriptions.Item>
           {(userRole === 'admin' || userRole === 'superadmin') && (
             <Descriptions.Item label={t('credential.UserID')} span={md ? 2 : 1}>
-              {(() => {
-                const ownerEmail = session.owner?.email;
-                return ownerEmail ? (
-                  ownerEmail
-                ) : session.user_id ? (
+              {session.owner?.email ? (
+                session.owner.email
+              ) : session.user_id ? (
                 <Suspense fallback={<Skeleton.Input size="small" active />}>
                   <UNSAFELazyUserEmailView uuid={session.user_id} />
                 </Suspense>

src/lib/backend.ai-client-esm.ts

@@ -804,7 +804,6 @@ class Client {
     if (this.isManagerVersionCompatibleWith('25.12.0')) {
       this._features['mount-by-id'] = true;
     }
-    // TODO: 버전 25.13.0
     if (this.isManagerVersionCompatibleWith('25.13.0')) {
       this._features['pending-session-list'] = true;
     }