Release JNI event listener array elements

[fyrsta7]

Summary

Fixes #14972 by releasing the jlongArray elements acquired while copying Java event listeners into native shared pointers.

Details

rocksdb_set_event_listeners_helper calls GetLongArrayElements to read the listener handles, but did not release the returned pointer after copying the values. This adds the matching ReleaseLongArrayElements call with JNI_ABORT, since the native code does not modify the Java array.

Validation

I built RocksJava and ran the repository's Java test runner with JNI checking enabled:

JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64 make -j8 rocksdbjava
JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64 \
  make -C java run_test \
  ALL_JAVA_TESTS='org.rocksdb.OptionsTest org.rocksdb.DBOptionsTest'

OptionsTest (141 tests), DBOptionsTest (84 tests), and the runner's StatisticsTest (8 tests) all passed with no failures or errors. Both options test classes exercise setListeners and listeners, including replacing a non-empty listener list with an empty list.