Update data archives for SO integration tests (elastic#204561)

## Summary

Bumping the data archives to 8.last (8.18 at the moment) so that ES 9.0
finds it compatible.

Resolves elastic#158318.
Resolves elastic#163254.
Resolves elastic#163255.
Resolves elastic#166190.
Resolves elastic#166199.
Resolves elastic#167676.

(cherry picked from commit 523372f)

src/core/server/integration_tests/saved_objects/migrations/group3/actions/actions_test_suite.ts

@@ -770,10 +770,9 @@ export const runActionTestSuite = ({
     });
   });
 
-  // Reindex doesn't return any errors on it's own, so we have to test
+  // Reindex doesn't return any errors on its own, so we have to test
   // together with waitForReindexTask
-  // Failing: See https://github.com/elastic/kibana/issues/166190
-  describe.skip('reindex & waitForReindexTask', () => {
+  describe('reindex & waitForReindexTask', () => {
     it('resolves right when reindex succeeds without reindex script', async () => {
       const res = (await reindex({
         client,
@@ -1444,8 +1443,7 @@ export const runActionTestSuite = ({
     });
   });
 
-  // FLAKY: https://github.com/elastic/kibana/issues/166199
-  describe.skip('waitForPickupUpdatedMappingsTask', () => {
+  describe('waitForPickupUpdatedMappingsTask', () => {
     it('rejects if there are failures', async () => {
       const res = (await pickupUpdatedMappings(
         client,