SSPROD-55868: Add flag for automatic onboarding in Organization resource (#630)

* SSPROD-55868: Add flag for automatic onboarding in Organization resource

Change summary:
---------------
1. Adding a new field in organization resource for automatic_onboarding
2. Updated unit test and docs

* Make default for new schema field as false

Author: ravinadhruve10

sysdig/common.go

@@ -90,6 +90,7 @@ const (
 	SchemaIncludedCloudAccounts         = "included_cloud_accounts"
 	SchemaExcludedCloudAccounts         = "excluded_cloud_accounts"
 	SchemaOrganizationRootID            = "organization_root_id"
+	SchemaAutomaticOnboarding           = "automatic_onboarding"
 	SchemaCloudProviderTenantId         = "provider_tenant_id"
 	SchemaCloudProviderAlias            = "provider_alias"
 	SchemaAccountId                     = "account_id"