MINOR: cherry pick KAFKA-13973 to 3.5#14592

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cadonna wants to merge 2 commits intoapache:3.5from

cadonna:cherry-pick_KAFKA-13973_to_3.5

Commits on Oct 19, 2023

KAFKA-7438: Replace Easymock & Powermock with Mockito in RocksDBMetricsRecorderGaugesTest (#14190)

bachmanity1
authored and
cadonna
committed
KAFKA-13973: Fix inflated block cache metrics (#14317)

nicktelford
authored and
cadonna
committed