feat: add integration types validation

Service integrations field gets only allowed integration types (from the API), like `read_replica` or `disaster_recovery`.
Most of service types just do not support those integrations, hence, it shouldn't be even possible to set them.

internal/schemautil/service.go

@@ -76,9 +76,16 @@ func ServiceCommonSchemaWithUserConfig(kind string) map[string]*schema.Schema {
 
 	// Assigns the integration types that are allowed to be set when creating a service
 	integrations := getBootstrapIntegrationTypes(kind)
-	if len(integrations) > 0 {
+	switch len(integrations) {
+	case 0:
+		// Disables the service integrations field if there are no integrations supported
+		s[serviceIntegrationsKey].ValidateFunc = func(v any, _ string) ([]string, []error) {
+			return nil, []error{fmt.Errorf("service integration %s can't be specified here", v)}
+		}
+	default:
 		r := s[serviceIntegrationsKey].Elem.(*schema.Resource)
 		r.Schema["integration_type"].Description = userconfig.Desc(r.Schema["integration_type"].Description).PossibleValuesString(FlattenToString(integrations)...).Build()
+		r.Schema["integration_type"].ValidateFunc = validation.StringInSlice(FlattenToString(integrations), false)
 	}
 
 	return s