[Reporting] Serverless API/Functional tests: fix to delete all reports (#184616)

I was looking at proxy logs for an API integration test in serverless,
and I noticed that when called on ES to delete all reports, we are using
the "old" index pattern, which should have been updated when we switched
Reporting to use a data stream.

We sometimes need to delete all of the reports from storage for testing,
because we validate that a certain list of reports will appear in the
list of reports will be returned from the "listing" API.

Flaky test run:
https://buildkite.com/elastic/kibana-flaky-test-suite-runner/builds/6206

---------

Co-authored-by: kibanamachine <42973632+kibanamachine@users.noreply.github.com>

x-pack/test_serverless/shared/services/svl_reporting.ts

@@ -9,6 +9,7 @@ import { X_ELASTIC_INTERNAL_ORIGIN_REQUEST } from '@kbn/core-http-common';
 import expect from '@kbn/expect';
 import { INTERNAL_ROUTES } from '@kbn/reporting-common';
 import type { ReportingJobResponse } from '@kbn/reporting-plugin/server/types';
+import { REPORTING_DATA_STREAM_WILDCARD_WITH_LEGACY } from '@kbn/reporting-server';
 import rison from '@kbn/rison';
 import { FtrProviderContext } from '../../functional/ftr_provider_context';
 
@@ -118,7 +119,9 @@ export function SvlReportingServiceProvider({ getService }: FtrProviderContext)
 
       // ignores 409 errs and keeps retrying
       await retry.tryForTime(5000, async () => {
-        await supertest.post('/.reporting*/_delete_by_query').send({ query: { match_all: {} } });
+        await supertest
+          .post(`/${REPORTING_DATA_STREAM_WILDCARD_WITH_LEGACY}/_delete_by_query`)
+          .send({ query: { match_all: {} } });
       });
     },
   };

x-pack/test_serverless/tsconfig.json

@@ -100,6 +100,7 @@
     "@kbn/synthetics-plugin",
     "@kbn/dataset-quality-plugin",
     "@kbn/alerting-comparators",
-    "@kbn/search-types"
+    "@kbn/search-types",
+    "@kbn/reporting-server"
   ]
 }