add async operation polling after apply

[gregmankes]

What was changed

Why?

Checklist

1. Closes

2. How was this tested:

3. Any docs updates needed?

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Note

Low Risk
Test-only change that adds explicit waiting for async completion; minimal product risk aside from potentially increasing test runtime.

Overview
Updates the namespace integration CRUD test to wait for namespace apply async operations to complete before issuing follow-up get assertions.

The test now re-parses the MutationResult from apply output on both create and update, extracts AsyncOp.Id, and calls pollAsyncOperation using a shared cloud client to reduce flakiness from eventual consistency.

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