fix(build-system-tests): pass --no-gitInit & --packageManager to nuxi init for CI (#7029)

* fix(build-system-tests): pass --no-gitInit to nuxi init for CI

nuxi >=3.36 now requires an explicit --gitInit/--no-gitInit argument when
run in a non-interactive terminal. The hourly Build System Test Canary
(vue/nuxt latest) job pins nuxi@latest, so the new CLI broke 'nuxi init'
with:

  Non-interactive terminal detected. Missing required argument: --gitInit
  Process completed with exit code 2

The mega-app is throwaway and needs no git repo, so pass --no-gitInit.

Fixes the Github Build System Test Failure alarm (V2257625415).

* fix(build-system-tests): also pass --packageManager=npm to nuxi init

nuxi >=3.36 requires BOTH --gitInit and --packageManager as explicit flags
in a non-interactive terminal. --no-gitInit alone advances to a second
failure: 'Missing required argument: --packageManager'. Verified locally
that 'nuxi init -t v4 --no-gitInit --packageManager=npm' exits 0 and
scaffolds the project. build-system-tests is npm-based throughout.

Author: bobbor

build-system-tests/scripts/mega-app-create-app.sh

@@ -91,8 +91,13 @@ if [[ "$FRAMEWORK" == 'vue' ]]; then
         echo "vue create --preset ../templates/components/vue/preset-${FRAMEWORK_VERSION}.json $MEGA_APP_NAME"
         echo 'Y' | vue create --preset ../templates/components/vue/preset-${FRAMEWORK_VERSION}.json $MEGA_APP_NAME
     elif [ "$BUILD_TOOL" == 'nuxt' ]; then
-        echo "npx nuxi@latest init $MEGA_APP_NAME -t v4"
-        npx nuxi@latest init $MEGA_APP_NAME -t v4
+        # nuxi >=3.36 no longer defaults the interactive prompts in a non-interactive
+        # terminal (CI); it requires them as explicit flags or fails with exit code 2.
+        # Two prompts apply here: --gitInit (the mega-app is throwaway, no git repo
+        # needed -> --no-gitInit) and --packageManager (the rest of build-system-tests
+        # is npm-based -> npm).
+        echo "npx nuxi@latest init $MEGA_APP_NAME -t v4 --no-gitInit --packageManager=npm"
+        npx nuxi@latest init $MEGA_APP_NAME -t v4 --no-gitInit --packageManager=npm
     fi
 fi