fix: when enabled, build should be always run

If not explictly disabled, the Node build should be always run.
Should not apply the test policy rules (Adaptive Pipeline).

BREAKING CHANGE: restoring the expected behavior might break some projects pipeline

templates/gitlab-ci-node.yml

@@ -679,8 +679,8 @@ node-build:
     expire_in: 1 day
   rules:
     # always if $NODE_BUILD_DISABLED not set
-    - if: '$NODE_BUILD_DISABLED == "true"'
-      when: never
+    - if: '$NODE_BUILD_DISABLED != "true"'
+    # else (test only): apply test-policy
     - !reference [.test-policy, rules]
 
 node-lint: