Happy Path: Use chectl auth:login flow in PR checks

This is needed because of che-incubator/chectl#910

Signed-off-by: Radim Hopp <rhopp@redhat.com>

tests/.infra/crw-ci/pr-check/k8s/Jenkinsfile

@@ -324,17 +324,11 @@ EOL"""
                         ).trim()
                     }
 
-                    sh """       
-                        USER_ACCESS_TOKEN=\$(curl -k -X POST https://${KEYCLOAK_BASE_URL}/auth/realms/che/protocol/openid-connect/token \\
-                           -H "Content-Type: application/x-www-form-urlencoded" \\
-                           -d "username=admin" \\
-                           -d "password=admin" \\
-                           -d "grant_type=password" \\
-                           -d "client_id=che-public" | jq -r .access_token)
-    
+                    sh """
+                        ${pathToChectl} auth:login -u admin -p admin --chenamespace=eclipse-che
+
                         ${pathToChectl} workspace:create --start \\
                            --devfile=${DEVFILE_PATH} \\
-                           --access-token "\$USER_ACCESS_TOKEN" \\
                            --chenamespace=eclipse-che
                     """
                 }