[Reporting/API Testing] Simplify config (elastic#43216) (elastic#43235)

- Remove injection of `x-pack/test/functional/config.js`
- No more starting the optimizer when running thees tests

x-pack/test/reporting/configs/generate_api.js

@@ -4,10 +4,17 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
+import { esTestConfig, kbnTestConfig } from '@kbn/test';
+import { format as formatUrl } from 'url';
 import { getApiIntegrationConfig } from '../../api_integration/config';
 import { getReportingApiConfig } from './api';
 
 export default async function ({ readConfigFile }) {
+  const servers = {
+    kibana: kbnTestConfig.getUrlParts(),
+    elasticsearch: esTestConfig.getUrlParts(),
+  };
+
   const apiTestConfig = await getApiIntegrationConfig({ readConfigFile });
   const reportingApiConfig = await getReportingApiConfig({ readConfigFile });
   const xPackFunctionalTestsConfig = await readConfigFile(require.resolve('../../functional/config.js'));
@@ -23,8 +30,16 @@ export default async function ({ readConfigFile }) {
     kbnTestServer: {
       ...xPackFunctionalTestsConfig.get('kbnTestServer'),
       serverArgs: [
-        ...xPackFunctionalTestsConfig.get('kbnTestServer.serverArgs'),
-        '--xpack.reporting.csv.enablePanelActionDownload=true',
+        `--optimize.enabled=false`,
+        `--logging.json=false`,
+        `--server.maxPayloadBytes=1679958`,
+        `--server.port=${kbnTestConfig.getPort()}`,
+        `--elasticsearch.hosts=${formatUrl(servers.elasticsearch)}`,
+        `--elasticsearch.password=${servers.elasticsearch.password}`,
+        `--elasticsearch.username=${servers.elasticsearch.username}`,
+        `--xpack.reporting.csv.enablePanelActionDownload=true`,
+        `--xpack.reporting.csv.maxSizeBytes=2850`,
+        `--xpack.reporting.queue.pollInterval=3000`,
       ],
     },
     esArchiver: apiTestConfig.esArchiver,