[FLINK-29610] [flink-runtime]: Use rest time out instead of RpcUtils.INF_TIMEOUT Infinite timeout in SavepointHandlers and CheckpointHandlers

[leletan]

What is the purpose of the change

This pull request makes SavepointHandlers and CheckpointHandlers call to RestfulGateway using timeout from their ancestor LeaderRetrievalHandler, instead of RpcUtils.INF_TIMEOUT

Brief change log

Use rest time out instead of RpcUtils.INF_TIMEOUT Infinite timeout in SavepointHandlers and CheckpointHandlers

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:

• 3ff4778 UNKNOWN
• fcc2a5c Azure: SUCCESS

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