Hide commands under preview from help output (#469)

## Changes

TSIA

Depends on https://github.com/databricks/databricks-sdk-go/pull/497.

## Tests

Manually looked at the help output and no longer see the hidden commands.

.codegen/service.go.tmpl

@@ -20,13 +20,18 @@ import (
 {{define "service"}}
 var Cmd = &cobra.Command{
 	Use:   "{{(.TrimPrefix "account").KebabName}}",
-    {{if .Description -}}
-    Short: `{{.Summary | without "`"}}`,
+	{{- if .Description }}
+	Short: `{{.Summary | without "`"}}`,
 	Long: `{{.Comment  "  " 80 | without "`"}}`,
-    {{- end}}
+	{{- end }}
 	Annotations: map[string]string{
 		"package": "{{ .Package.Name }}",
 	},
+	{{- if .IsPrivatePreview }}
+
+	// This service is being previewed; hide from help output.
+	Hidden: true,
+	{{- end }}
 }
 
 {{- $serviceName := .KebabName -}}
@@ -79,10 +84,16 @@ func init() {
 {{- $hasRequiredArgs := and (not $hasIdPrompt) $hasPosArgs -}}
 var {{.CamelName}}Cmd = &cobra.Command{
 	Use: "{{.KebabName}}{{if $hasPosArgs}}{{range .Request.RequiredFields}} {{.ConstantName}}{{end}}{{end}}",
-	{{if .Description -}}
-    Short: `{{.Summary | without "`"}}`,
+	{{- if .Description }}
+	Short: `{{.Summary | without "`"}}`,
 	Long: `{{.Comment  "  " 80 | without "`"}}`,
-    {{end}}
+	{{- end }}
+	{{- if .IsPrivatePreview }}
+
+	// This command is being previewed; hide from help output.
+	Hidden: true,
+	{{- end }}
+
 	Annotations: map[string]string{},{{if $hasRequiredArgs }}
 	Args: func(cmd *cobra.Command, args []string) error {
 		check := cobra.ExactArgs({{len .Request.RequiredFields}})

cmd/account/access-control/access-control.go

@@ -21,6 +21,9 @@ var Cmd = &cobra.Command{
 	Annotations: map[string]string{
 		"package": "iam",
 	},
+
+	// This service is being previewed; hide from help output.
+	Hidden: true,
 }
 
 // start get command

cmd/account/budgets/budgets.go

@@ -20,6 +20,9 @@ var Cmd = &cobra.Command{
 	Annotations: map[string]string{
 		"package": "billing",
 	},
+
+	// This service is being previewed; hide from help output.
+	Hidden: true,
 }
 
 // start create command

cmd/workspace/connections/connections.go

@@ -29,6 +29,9 @@ var Cmd = &cobra.Command{
 	Annotations: map[string]string{
 		"package": "catalog",
 	},
+
+	// This service is being previewed; hide from help output.
+	Hidden: true,
 }
 
 // start create command

cmd/workspace/metastores/metastores.go

@@ -333,6 +333,9 @@ var maintenanceCmd = &cobra.Command{
   
   Enables or disables auto maintenance on the metastore.`,
 
+	// This command is being previewed; hide from help output.
+	Hidden: true,
+
 	Annotations: map[string]string{},
 	Args: func(cmd *cobra.Command, args []string) error {
 		check := cobra.ExactArgs(2)

cmd/workspace/system-schemas/system-schemas.go

@@ -19,6 +19,9 @@ var Cmd = &cobra.Command{
 	Annotations: map[string]string{
 		"package": "catalog",
 	},
+
+	// This service is being previewed; hide from help output.
+	Hidden: true,
 }
 
 // start disable command

cmd/workspace/volumes/volumes.go

@@ -26,6 +26,9 @@ var Cmd = &cobra.Command{
 	Annotations: map[string]string{
 		"package": "catalog",
 	},
+
+	// This service is being previewed; hide from help output.
+	Hidden: true,
 }
 
 // start create command