[FLINK-24117][HA]Remove unHandledErrorListener in ZooKeeperLeaderElec…

[Aitozi]

…tionDriver and ZooKeeperLeaderRetrievalDriver

What is the purpose of the change

Remove the unnecessary curator handlers.

Verifying this change

This change is a code cleanup without any test coverage.

[Aitozi]

cc @tillrohrmann

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Last check on commit 95cca61 (Sun Sep 05 03:59:31 UTC 2021)

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[tillrohrmann]

Thanks for creating this PR @Aitozi. The changes look good to me. Merging this PR now.