Fix bandwidth-in quota update check#25877
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Motivation\nThe simple load manager suppresses small quota updates by comparing each new quota field with the matching old field. The bandwidth-in check was comparing the new bandwidth-in value against the old bandwidth-out value, which could trigger unnecessary quota writes when inbound and outbound quotas differ.\n\n### Modifications\n- Compare new bandwidth-in against old bandwidth-in in the quota update threshold check.\n- Extract the threshold decision into a package-private helper and add a focused regression test for mismatched bandwidth-in/out values.\n\n### Verifications\n- git diff --check\n- Attempted: ./gradlew :pulsar-broker:test --tests org.apache.pulsar.broker.loadbalance.impl.SimpleLoadManagerImplQuotaTest (could not run locally because no Java Runtime is installed in this environment)