delete namespace will fail if cache not updated immediately

**Describe the bug**
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**To Reproduce**
Steps to reproduce the behavior:
1. create namespace which routed to broker 1
2. delete namesapce which routed to broker 2

broker2 find no ns in cache，will return fail

**Expected behavior**
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**Screenshots**
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**Desktop (please complete the following information):**
- OS: [e.g. iOS]

**Additional context**
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same issue : https://github.com/apache/pulsar/issues/15555

Start with the reproduction steps: create a namespace routed to broker 1, then delete it through broker 2, and compare the behavior with issue 15555. Investigate how namespace cache state is used during deletion; done means deletion succeeds even when the receiving broker's cache has not updated immediately.

Written by the indexing model from the issue text.