## What is the purpose of the change

*This adds the `@RpcTimeout` annotation to `JobMasterGateway.triggerSavepoint` 
so that the default timeout is overridden.*

cc: @uce @tillrohrmann 

## Brief change log

  - *Add @RpcTimeout to `JobMasterGateway.triggerSavepoint`.*

## Verifying this change

This change added tests and can be verified as follows:

  - *Manually verified the change by running `SlowToCheckpoint` job attached to 
FLINK-10193 issue.*

## Does this pull request potentially affect one of the following parts:

  - Dependencies (does it add or upgrade a dependency): (yes / **no**)
  - The public API, i.e., is any changed class annotated with 
`@Public(Evolving)`: (yes / **no**)
  - The serializers: (yes / **no** / don't know)
  - The runtime per-record code paths (performance sensitive): (yes / **no** / 
don't know)
  - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Yarn/Mesos, ZooKeeper: (**yes** / no / don't know)
  - The S3 file system connector: (yes / **no** / don't know)

## Documentation

  - Does this pull request introduce a new feature? (yes / **no**)
  - If yes, how is the feature documented? (**not applicable** / docs / 
JavaDocs / not documented)


[ Full content available at: https://github.com/apache/flink/pull/6601 ]
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