feat(dataflow)!: update the API

BREAKING CHANGE: This release has breaking changes.
#### dataflow:v1b3
The following keys were deleted:
- schemas.LaunchFlexTemplateParameter.properties.transformNameMappings.additionalProperties.type
- schemas.LaunchFlexTemplateParameter.properties.transformNameMappings.description
- schemas.LaunchFlexTemplateParameter.properties.transformNameMappings.type
- schemas.LaunchFlexTemplateParameter.properties.update.description
- schemas.LaunchFlexTemplateParameter.properties.update.type

The following keys were changed:
- schemas.LaunchFlexTemplateParameter.properties.jobName.description

discovery/dataflow-v1b3.json

@@ -2443,7 +2443,7 @@
       }
     }
   },
-  "revision": "20201106",
+  "revision": "20201023",
   "rootUrl": "https://dataflow.googleapis.com/",
   "schemas": {
     "ApproximateProgress": {
@@ -4246,7 +4246,7 @@
           "description": "The runtime environment for the FlexTemplate job"
         },
         "jobName": {
-          "description": "Required. The job name to use for the created job. For update job request, job name should be same as the existing running job.",
+          "description": "Required. The job name to use for the created job.",
           "type": "string"
         },
         "launchOptions": {
@@ -4262,17 +4262,6 @@
           },
           "description": "The parameters for FlexTemplate. Ex. {\"num_workers\":\"5\"}",
           "type": "object"
-        },
-        "transformNameMappings": {
-          "additionalProperties": {
-            "type": "string"
-          },
-          "description": "Users need to set transform_name_mappings Ex:{\"oldTransformName\":\"newTransformName\",...}'",
-          "type": "object"
-        },
-        "update": {
-          "description": "Set this to true if you are sending a request to update a running streaming job. When set, the job name should be the same as the running job.",
-          "type": "boolean"
         }
       },
       "type": "object"

src/apis/dataflow/v1b3.ts

@@ -1385,7 +1385,7 @@ export namespace dataflow_v1b3 {
      */
     environment?: Schema$FlexTemplateRuntimeEnvironment;
     /**
-     * Required. The job name to use for the created job. For update job request, job name should be same as the existing running job.
+     * Required. The job name to use for the created job.
      */
     jobName?: string | null;
     /**
@@ -1396,14 +1396,6 @@ export namespace dataflow_v1b3 {
      * The parameters for FlexTemplate. Ex. {"num_workers":"5"\}
      */
     parameters?: {[key: string]: string} | null;
-    /**
-     * Users need to set transform_name_mappings Ex:{"oldTransformName":"newTransformName",...\}'
-     */
-    transformNameMappings?: {[key: string]: string} | null;
-    /**
-     * Set this to true if you are sending a request to update a running streaming job. When set, the job name should be the same as the running job.
-     */
-    update?: boolean | null;
   }
   /**
    * A request to launch a Cloud Dataflow job from a FlexTemplate.