[FLINK-33591][table] Cleanup usage of deprecated TableTestBase#addFunction

[snuyanzin]

What is the purpose of the change

Removes the usage of the deprecated method TableTestBase#addFunction

Brief change log

Replace the usage of TableTestBase#addFunction with TableTestBase#addFunction#addTemporarySystemFunction

Verifying this change

This change is a trivial rework / code cleanup without any test coverage.

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:

• 4412219 Azure: SUCCESS

Bot commands

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• @flinkbot run azure re-run the last Azure build

[liuyongvs]

LGTM

[JingGe]

LGTM

[snuyanzin]

thanks for taking a look