[Security Solutions] Makes legacy actions/notification system, legacy action status, and exception lists multiple space shareable (#115427)

## Summary

See https://github.com/elastic/kibana/issues/114548

Makes the following saved objects multiple-isolated:
* siem-detection-engine-rule-status
* exception-list
* siem-detection-engine-rule-actions

### Checklist

Delete any items that are not applicable to this PR.

- [x] [Unit or functional tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html) were updated or added to match the most common scenarios

x-pack/plugins/lists/server/saved_objects/exception_list.ts

@@ -177,11 +177,12 @@ const combinedMappings: SavedObjectsType['mappings'] = {
 };
 
 export const exceptionListType: SavedObjectsType = {
+  convertToMultiNamespaceTypeVersion: '8.0.0',
   hidden: false,
   mappings: combinedMappings,
   migrations,
   name: exceptionListSavedObjectType,
-  namespaceType: 'single',
+  namespaceType: 'multiple-isolated',
 };
 
 export const exceptionListAgnosticType: SavedObjectsType = {

x-pack/plugins/security_solution/server/lib/detection_engine/rule_actions/legacy_saved_object_mappings.ts

@@ -59,9 +59,10 @@ const legacyRuleActionsSavedObjectMappings: SavedObjectsType['mappings'] = {
  * @deprecated Remove this once we no longer need legacy migrations for rule actions (8.0.0)
  */
 export const legacyType: SavedObjectsType = {
+  convertToMultiNamespaceTypeVersion: '8.0.0',
   name: legacyRuleActionsSavedObjectType,
   hidden: false,
-  namespaceType: 'single',
+  namespaceType: 'multiple-isolated',
   mappings: legacyRuleActionsSavedObjectMappings,
   migrations: legacyRuleActionsSavedObjectMigration,
 };

x-pack/plugins/security_solution/server/lib/detection_engine/rules/legacy_rule_status/legacy_rule_status_saved_object_mappings.ts

@@ -65,9 +65,10 @@ export const ruleStatusSavedObjectMappings: SavedObjectsType['mappings'] = {
  * @deprecated Remove this once we've fully migrated to event-log and no longer require addition status SO (8.x)
  */
 export const legacyRuleStatusType: SavedObjectsType = {
+  convertToMultiNamespaceTypeVersion: '8.0.0',
   name: legacyRuleStatusSavedObjectType,
   hidden: false,
-  namespaceType: 'single',
+  namespaceType: 'multiple-isolated',
   mappings: ruleStatusSavedObjectMappings,
   migrations: legacyRuleStatusSavedObjectMigration,
 };