Dataproc: updates to cluster controller config (via synth).

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Here's the log from Synthtool:

synthtool > You are running the synthesis script directly, this will be disabled in a future release of Synthtool. Please use python3 -m synthtool instead. synthtool > Ensuring dependencies. synthtool > Pulling artman image. latest: Pulling from googleapis/artman Digest: sha256:2f6b261ee7fe1aedf238991c93a20b3820de37a343d0cacf3e3e9555c2aaf2ea Status: Image is up to date for googleapis/artman:latest synthtool > Cloning googleapis. synthtool > Running generator for google/cloud/dataproc/artman_dataproc_v1beta2.yaml. synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/dataproc-v1beta2. synthtool > Replaced 'metadata_type=operations_pb2.ClusterOperationMetadata,' in google/cloud/dataproc_v1beta2/gapic/cluster_controller_client.py. synthtool > Replaced '\\s+Note:.*\n(.*\n)+?.*types.FieldMask.' in google/cloud/dataproc_v1beta2/gapic/cluster_controller_client.py. synthtool > Replaced ', and must\n\\s+conform to the following PCRE regular expression:(.*\n)+?.*No more than 32' in google/cloud/dataproc_v1beta2/proto/workflow_templates_pb2.py. synthtool > Replaced ', and must conform to\n\\s+the following regular expression:(.*\n)+?.* No more than' in google/cloud/dataproc_v1beta2/proto/workflow_templates_pb2.py. synthtool > Running generator for google/cloud/dataproc/artman_dataproc_v1.yaml. synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/dataproc-v1. synthtool > Replaced 'metadata_type=operations_pb2.ClusterOperationMetadata,' in google/cloud/dataproc_v1/gapic/cluster_controller_client.py. synthtool > Replaced '\\s+Note:.*\n(.*\n)+?.*types.FieldMask.' in google/cloud/dataproc_v1/gapic/cluster_controller_client.py. synthtool > Replaced ', and must\n\\s+conform to the following PCRE regular expression:(.*\n)+?.*No more than 32' in google/cloud/dataproc_v1/proto/workflow_templates_pb2.py. synthtool > Replaced ', and must conform to\n\\s+the following regular expression:(.*\n)+?.* No more than' in google/cloud/dataproc_v1/proto/workflow_templates_pb2.py. synthtool > Replaced '# Generated by the protocol buffer compiler. DO NOT EDIT!' in google/cloud/dataproc_v1beta2/proto/clusters_pb2.py. synthtool > Cleaned up 0 temporary directories. 

[tseaver]

Does contain the order-of-enums-unstable bug: googleapis/gapic-generator#2319

But the other changes are significant.