[FLINK-26624][Runtime] 1.18 backport Running HA (hashmap, async) end-to-end test failed on azu

[victor09091]

1.18 backport for PR #23614

What is the purpose of the change

(Running HA (hashmap, async) end-to-end test failed on azure due to unable to find master logs.)

Brief change log

• 1.18 backport PR, modify verify_num_occurences_in_logs.sh, Changed uniq to sort -u

Verifying this change

• This change is already covered by existing test.

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): (no)
• The public API, i.e., is any changed class annotated with @Public(Evolving): (no)
• The serializers: (no)
• The runtime per-record code paths (performance sensitive): (no)
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (no)
• The S3 file system connector: (no)

Documentation

• Does this pull request introduce a new feature? no)
• If yes, how is the feature documented? (not applicable)

[flinkbot]

CI report:

• 398f8f4 Azure: SUCCESS

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