Removing gulp as legacy and no longer required

ci/npm-gulp.yml

@@ -1,28 +0,0 @@
-name: NodeJS with Gulp
-
-on:
-  push:
-    branches: [ $default-branch ]
-  pull_request:
-    branches: [ $default-branch ]
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-
-    strategy:
-      matrix:
-        node-version: [18.x, 20.x, 22.x]
-
-    steps:
-    - uses: actions/checkout@v4
-
-    - name: Use Node.js ${{ matrix.node-version }}
-      uses: actions/setup-node@v4
-      with:
-        node-version: ${{ matrix.node-version }}
-
-    - name: Build
-      run: |
-        npm install
-        gulp

ci/properties/npm-gulp.properties.json

@@ -1,6 +0,0 @@
-{
-    "name": "Gulp",
-    "description": "Build a NodeJS project with npm and gulp.",
-    "iconName": "gulp",
-    "categories": ["Continuous integration", "JavaScript", "TypeScript", "npm", "Gulp"]
-}