Rachel Yen

Support stop GCE instance instead of Termination

8

As requested [here](https://issues.jenkins-ci.org/browse/JENKINS-50310) "Currently the google-compute-engine-plugin creates jenkins node and terminates them if idle. Instead of terminate, it's better to support stop the instance when idle."

After a worker has been created, it's not obvious which specific instance configuration created it. On create, we should either set the instance config as a property of the worker...

Currently, the plugin uses an executor class and retry logic from performUploadWithRetry and RetryStorageOperation. The plugin should be refactored to use the StorageClient to have consistent logic with the other...