revert adding usernames to test.yml

Author: dimuon

.github/workflows/test.yml

@@ -52,7 +52,6 @@ jobs:
     needs: build
     runs-on: ubuntu-latest
     env:
-      ELASTICSEARCH_USERNAME: elastic
       ELASTIC_PASSWORD: password
       KIBANA_SYSTEM_USERNAME: kibana_system
       KIBANA_SYSTEM_PASSWORD: password
@@ -99,7 +98,6 @@ jobs:
           KIBANA_HOST: http://kibana:5601
           KIBANA_FLEET_SETUP: "1"
           KIBANA_FLEET_PASSWORD: ${{ env.ELASTIC_PASSWORD }}
-          KIBANA_FLEET_USERNAME: ${{ env.ELASTICSEARCH_USERNAME }}
         ports:
           - 8220:8220
         options: --restart="unless-stopped"