[fix][test] Fix flaky BacklogQuotaManagerTest.createNamespaces (HTTP 409 cascade)#25680

merlimat merged 1 commit intoapache:masterapache/pulsar:masterfrom

lhotari:lh-fix-flaky-BacklogQuotaManagerTestlhotari/pulsar:lh-fix-flaky-BacklogQuotaManagerTestCopy head branch name to clipboard