[cleanup][client] Remove unnecessary pause/resume logic from MultiTopicsConsumerImpl and cleanup putIfAbsent logic#25009

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lhotari:lh-fix-multi-topics-subscribing-permits

Commits on Nov 21, 2025

[fix][client] Fix problem where flow permits get requested before all topics have been subscribed to
lhotari
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Refactor the logic consumers.putIfAbsent logic
lhotari
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