Add operator to collect diagnostic tarball for Dataproc cluster

[flacode]

1. Make diagnose_cluster hook return Operation object just like the rest of the hooks.
2. Rename DataprocWorkflowTrigger to DataprocOperationTrigger handle all types of operations for get_operation.
3. Add new operator to capture diagnostic tarball for Dataproc clusters.

closes: #36173

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[boring-cyborg]

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[boring-cyborg]

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