chore(tests): Enable testing on node.js v18.x on GitHub CI (#6619)

* chore(tests): Enable testing on node.js v18.x on GitHub CI

* chore(tests): Remove outdated calls to test:prepare npm script

The calls to `npm run test:prepare` in `tests/scripts/setup_*_env.sh`
should have been removed along with that npm script in PR #4906.

* chore(deps): Fix alphabetisation in package.json

.github/workflows/build.yml

@@ -17,8 +17,9 @@ jobs:
         # TODO (#2114): re-enable osx build.
         # os: [ubuntu-latest, macos-latest]
         os: [ubuntu-latest]
-        node-version: [14.x, 16.x]
-        # See supported Node.js release schedule at https://nodejs.org/en/about/releases/
+        node-version: [14.x, 16.x, 18.x]
+        # See supported Node.js release schedule at
+        # https://nodejs.org/en/about/releases/
 
     steps:
     - uses: actions/checkout@v3

package.json

@@ -89,8 +89,8 @@
     "gulp": "^4.0.2",
     "gulp-clang-format": "^1.0.27",
     "gulp-concat": "^2.6.1",
-    "gulp-header": "^2.0.9",
     "gulp-gzip": "^1.4.2",
+    "gulp-header": "^2.0.9",
     "gulp-insert": "^0.5.0",
     "gulp-rename": "^2.0.0",
     "gulp-replace": "^1.0.0",

tests/scripts/setup_linux_env.sh

@@ -4,5 +4,4 @@ if [ "${RUNNER_OS}" == "Linux" ]
   then
     Xvfb :99 &
     export DISPLAY=:99 &
-    npm run test:prepare > /dev/null &
 fi

tests/scripts/setup_osx_env.sh

@@ -3,5 +3,4 @@
 if [ "${RUNNER_OS}" == "macOS" ]
   then
     export CHROME_BIN="/Applications/Google Chrome.app"
-    npm run test:prepare > /dev/null &
 fi