[fix][broker] Fix dispatcherPauseOnAckStatePersistentEnabled and schemaValidationEnforced returning wrong values when applied=true

[void-ptr974]

Problem

Two topic policy queries could return the wrong effective value when
applied=true:

• dispatcherPauseOnAckStatePersistentEnabled returned false when it was
  enabled at the namespace or broker level and was not set on the topic.
• schemaValidationEnforced returned false for an explicit topic value of
  false even when the broker setting was true and forced schema validation
  at runtime.

Fix

• Resolve the applied dispatcher pause value from topic, namespace, and broker
  settings while preserving explicit false overrides.
• Include broker-level schema validation in the applied topic value while still
  allowing topic false to override namespace true when the broker setting is
  disabled.
• Keep applied=false, remove behavior, and local/global policy scopes
  unchanged.
• Keep policy lookups asynchronous without loading topics.
• Add regression tests for inheritance, overrides, unset values, and query
  modes.

Tests

• AckStatePausePolicyTest: 9 passed
• AdminApiSchemaValidationEnforcedTest: 7 passed
• ./gradlew quickCheck: passed