[FLINK-25466][state] Enable state descriptor to handle StateTtlConfig#DISABLED

[Myasuka]

What is the purpose of the change

Enable state descriptor to handle StateTtlConfig#DISABLED.

Brief change log

Modify current implementation to let state descriptor could handle StateTtlConfig.DISABLED.

Verifying this change

This change added tests and can be verified as follows:

Added StateDescriptorTest#testStateTTlConfig

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

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Automated Checks

Last check on commit 7c60f02 (Tue Dec 28 08:02:12 UTC 2021)

Warnings:

• No documentation files were touched! Remember to keep the Flink docs up to date!

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Review Progress

• ❓ 1. The [description] looks good.
• ❓ 2. There is [consensus] that the contribution should go into to Flink.
• ❓ 3. Needs [attention] from.
• ❓ 4. The change fits into the overall [architecture].
• ❓ 5. Overall code [quality] is good.

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CI report:

• 28f16dc Azure: SUCCESS

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[curcur]

LGTM