[8.x] [Response Ops][Rules] Rule Model Version Forward Compat (#193233)…

… (#193695)

# Backport

This will backport the following commits from `main` to `8.x`:
- [[Response Ops][Rules] Rule Model Version Forward Compat
(#193233)](#193233)

<!--- Backport version: 9.4.3 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

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Summary\r\n\r\nThis PR implements the `forwardCompatibility` field for
the rule model\r\nversion in preparation for the flapping
PR\r\n(#190019). We're doing this
so we\r\nhave the point to revert back to if we need to where
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so we\r\nhave the point to revert back to if we need to where
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so we\r\nhave the point to revert back to if we need to where
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Co-authored-by: Jiawei Wu <74562234+JiaweiWu@users.noreply.github.com>

src/core/server/integration_tests/ci_checks/saved_objects/check_registered_types.test.ts

@@ -59,7 +59,7 @@ describe('checking migration metadata changes on all registered SO types', () =>
         "action": "0e6fc0b74c7312a8c11ff6b14437b93a997358b8",
         "action_task_params": "b50cb5c8a493881474918e8d4985e61374ca4c30",
         "ad_hoc_run_params": "d4e3c5c794151d0a4f5c71e886b2aa638da73ad2",
-        "alert": "3a67d3f1db80af36bd57aaea47ecfef87e43c58f",
+        "alert": "e920b0583b1a32338d5dbbbfabb6ff2a511f5f6c",
         "api_key_pending_invalidation": "1399e87ca37b3d3a65d269c924eda70726cfe886",
         "apm-custom-dashboards": "b67128f78160c288bd7efe25b2da6e2afd5e82fc",
         "apm-indices": "8a2d68d415a4b542b26b0d292034a28ffac6fed4",

x-pack/plugins/alerting/server/saved_objects/model_versions/rule_model_versions.ts

@@ -12,6 +12,7 @@ export const ruleModelVersions: SavedObjectsModelVersionMap = {
   '1': {
     changes: [],
     schemas: {
+      forwardCompatibility: rawRuleSchemaV1.extends({}, { unknowns: 'ignore' }),
       create: rawRuleSchemaV1,
     },
   },