After using ns-isolation-policy, topics unload is invalid, only namespace unload is valid

**Describe the bug**
After using ns-isolation-policy, topics unload is invalid, only namespace unload is valid

**To Reproduce**
Steps to reproduce the behavior:
```
1. ./bin/pulsar-admin ns-isolation-policy set --auto-failover-policy-type min_available \ --auto-failover-policy-params min_limit=1,usage_threshold=80 \ --namespaces zcola_20220329/test --primary 7.32.133.237.* \ pulsar-19990 policy-zcola_qos-test
2. ./bin/pulsar-admin topics partitioned-lookup persistent://zcola_20220329/test/test
3. ./bin/pulsar-admin topics unload zcola_20220329/test/test **not work**
./bin/pulsar-admin topics partitioned-lookup persistent://zcola_20220329/test/test
"persistent://zcola_20220329/test/test-partition-0 pulsar://7.32.133.235:6650"
"persistent://zcola_20220329/test/test-partition-1 pulsar://7.32.133.235:6650"
"persistent://zcola_20220329/test/test-partition-2 pulsar://7.32.133.235:6650"
5. ./bin/pulsar-admin namespaces unload zcola_20220329/test **it work**
./bin/pulsar-admin topics partitioned-lookup persistent://zcola_20220329/test/test
"persistent://zcola_20220329/test/test-partition-0 pulsar://7.32.133.237:6650"
"persistent://zcola_20220329/test/test-partition-1 pulsar://7.32.133.237:6650"
"persistent://zcola_20220329/test/test-partition-2 pulsar://7.32.133.237:6650"
```

**Expected behavior**
A clear and concise description of what you expected to happen.

**Screenshots**
If applicable, add screenshots to help explain your problem.

**Desktop (please complete the following information):**
- pulsar 2.9.1

**Additional context**
Ralated #14728