Updated change log for namespace release

[weli02]

Proposed changes

Problem: Need to support namespace rbac permission control at Nginx One Console

Solution: Nginx One Console now support multi-namespace, allowing users to configure a more granular Rbac permissions for different users.

Testing: Navigate to N1 Console and can select different namespaces.

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specific feedback, add them here.

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Closes #ISSUE

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[github-actions]

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2 out of 3 committers have signed the CLA.
✅ (mjang)[https://github.com/mjang]
✅ (ADubhlaoich)[https://github.com/ADubhlaoich]
❌ @weli02
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[mjang]

Schedule updated. Looks ready for April 23.

• Moved from draft -> ready

[ADubhlaoich]

@weli02 Please sign the CLA as instructed by the github-actions bot. It's punctuation sensitive, so the line has to be copied exactly.