[FLINK-34051][checkpoint] Fix equals/hashCode/toString for SavepointRestoreSettings

[masteryhx]

What is the purpose of the change

SavepointRestoreSettings#equals/hashCode/toString missed restoreMode property

Brief change log

• Add restoreMode property for SavepointRestoreSettings

Verifying this change

This change added tests and can be verified as follows:

• Added SavepointRestoreSettingsTest

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? no

[flinkbot]

CI report:

• 49ac0131e85e8b68884705e0cceeac84024dd237 Azure: SUCCESS

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