Build node addon before running tests (#7884)

Fix a race condition in CI where the tests may be run before the node addon is built.

Author: mattsoulanille

scripts/cloudbuild_tfjs_node_expected.yml

@@ -150,6 +150,7 @@ steps:
       - test-ci
     waitFor:
       - yarn-tfjs-node
+      - build-addon-tfjs-node
       - lint-tfjs-node
       - yarn-common
       - yarn-link-package-build

tfjs-node-gpu/cloudbuild.yml

@@ -59,7 +59,7 @@ steps:
   entrypoint: 'yarn'
   id: 'test'
   args: ['test-ci']
-  waitFor: ['yarn', 'build-deps', 'lint']
+  waitFor: ['yarn', 'build-addon', 'build-deps', 'lint']
 
 # CPU / GPU package alignment.
 - name: 'gcr.io/learnjs-174218/release'

tfjs-node/cloudbuild.yml

@@ -51,7 +51,7 @@ steps:
   entrypoint: 'yarn'
   id: 'test'
   args: ['test-ci']
-  waitFor: ['yarn', 'build-deps', 'lint']
+  waitFor: ['yarn', 'build-addon', 'build-deps', 'lint']
 
 # CPU / GPU package alignment.
 - name: 'gcr.io/learnjs-174218/release'