Set disbaleSsh default value to true for workstation create (#11225)

Co-authored-by: Cameron Thornton <[email protected]>

Author: tejal29

mmv1/products/workstations/WorkstationConfig.yaml

@@ -276,6 +276,8 @@ properties:
               Whether instances have no public IP address.
           - !ruby/object:Api::Type::Boolean
             name: 'disableSsh'
+            default_value: true
+            send_empty_value: true
             description: |
               Whether to disable SSH access to the VM.
           - !ruby/object:Api::Type::Boolean

mmv1/third_party/terraform/website/docs/guides/version_6_upgrade.html.markdown

@@ -322,6 +322,12 @@ on the resource through Terraform and the default labels configured on the provi
 * The new output-only `effective_labels` field lists all of labels present on the resource
 in GCP, including the labels configured through Terraform, the system, and other clients.
 
+## Resource: `google_workstations_workstation_config`
+
+### `host.gce_instance.disable_ssh` now defaults to true
+
+* `disable_ssh` field now defaults to true. To enable SSH, please set `disable_ssh` to false.
+
 ## Removals
 
 ### Resource: `google_identity_platform_project_default_config` is now removed