feat: Make private_key_data sensitive (#144)

While I was importing the serviceaccount resources, I noticed that it
echoes the private_key_data to the console during a terraform plan.

Co-authored-by: Rui Fu <[email protected]>

Author: mikkergimenez

cloud/data_source_service_account.go

@@ -63,6 +63,7 @@ func dataSourceServiceAccount() *schema.Resource {
 				Type:        schema.TypeString,
 				Description: descriptions["private_key_data"],
 				Computed:    true,
+				Sensitive:   true,
 			},
 		},
 	}

cloud/resource_service_account.go

@@ -84,6 +84,7 @@ func resourceServiceAccount() *schema.Resource {
 				Type:        schema.TypeString,
 				Description: descriptions["private_key_data"],
 				Computed:    true,
+				Sensitive:   true,
 			},
 		},
 		Timeouts: &schema.ResourceTimeout{