[7.x] [server/logging/tests] use --oss to load kibana faster and avoi…

…d timeouts (elastic#32162) (elastic#32164)

Backports the following commits to 7.x:
 - [server/logging/tests] use --oss to load kibana faster and avoid timeouts  (elastic#32162)

src/cli/serve/integration_tests/reload_logging_config.test.js

@@ -83,7 +83,7 @@ describe('Server logging configuration', function () {
     it('should be reloadable via SIGHUP process signaling', async function () {
       expect.assertions(3);
 
-      child = spawn(process.execPath, [kibanaPath, '--config', testConfigFile], {
+      child = spawn(process.execPath, [kibanaPath, '--config', testConfigFile, '--oss'], {
         stdio: 'pipe'
       });
 
@@ -174,6 +174,7 @@ describe('Server logging configuration', function () {
 
       child = spawn(process.execPath, [
         kibanaPath,
+        '--oss',
         '--config', testConfigFile,
         '--logging.dest', logPath,
         '--plugins.initialize', 'false',