Fix the completionObjects leak problem. (#4285) #4

Job	Run time
Typo Check	0s
PR Validation	8m 19s
Integration Tests	17m 30s
Backward compatibility tests	27m 37s
Compatibility Check Java8	18m 59s
Compatibility Check Java11	20m 2s
Build with macos on JDK 11	3m 31s
OWASP Dependency Check	1m 20s
Compatibility Check Java17	18m 39s
Bookie Tests	17m 41s
Compatibility Check Java21	18m 45s
Build with windows on JDK 11	8m 23s
Client Tests	26m 48s
Replication Tests	28m 25s
Remaining Tests	18m 56s
TLS Tests	9m 43s
StreamStorage Tests	18m 38s
Shell tests	25s
BookKeeper CI checks completed	1s
	4h 23m 42s

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