MM-52165 : Remove 50% maxWorker on Channels test run (#22962)

* test

* remove boards maxWorkers

---------

Co-authored-by: Caleb Roseland <caleb@calebroseland.com>
Co-authored-by: Mattermost Build <build@mattermost.com>

webapp/channels/build/contrib/gitlab/.gitlab-ci.yml

@@ -13,4 +13,4 @@ test:
   before_script:
     - npm ci --ignore-scripts
   script:
-    - npm run test:speed
+    - npm run test