[FLINK-29095][state] Improve logging in SharedStateRegistry

[fredia]

What is the purpose of the change

Improve logging in SharedStateRegistry
and make the conditional logic more clear.
This PR is copied from #20722 and address comment.

Verifying this change

This change is a trivial rework without any (new) 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 / docs / JavaDocs / not documented)

[flinkbot]

CI report:

• f65c8e9 Azure: SUCCESS

Bot commands

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[klion26]

@fredia thanks for the update, left some minor comments, please let me know what do you think about them, thanks.

[klion26]

@fredia thanks for the update, LGTM. will merge if there is not more comments from the community in the new days.

[klion26]

@fredia thanks for the contribution, merging it now.