[FLINK-29914][tests][backport] Wait for Kafka topic creation/deletion

[gaborgsomogyi]

What is the purpose of the change

Kafka creation/deletion is an async operation. The API gives back future(s) which must be waited in order to be on the safe side. Additionally the APIs can throw exceptions while waiting to finish. In this PR I've added a more or less consistent Kafka topic creation/deletion behavior to the tests. Namely future wait to all the places where it was missing. This may or may not fix the issue (Kafka itself can be buggy) but I'm pretty sure w/o consistent topic creation/deletion API usage we're in trouble.

Brief change log

• Wait for Kafka topic creation/deletion.
• Add random to test topic names

Verifying this change

Existing unit tests.

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

[gaborgsomogyi]

The only diff here is that there is no flink-end-to-end-tests/flink-sql-client-test/src/test/java/SqlClientITCase.java file so those changes are just not in the PR.

[gaborgsomogyi]

cc @XComp @gyfora

[flinkbot]

CI report:

• b5890e5 Azure: SUCCESS

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[MartijnVisser]

@gaborgsomogyi Thanks also for this backport, LGTM