ci: remove unused mobile workflow (#55526)

.github/workflows/e2e-mobile.yml

@@ -1,74 +0,0 @@
-name: CI - E2E - Mobile (webview) Browser
-on:
-  workflow_dispatch:
-
-jobs:
-  mobile-test:
-    name: Test curriculum for mobile app
-    runs-on: ubuntu-22.04
-    strategy:
-      matrix:
-        node-version: [20.x]
-
-    steps:
-      - name: Checkout Source Files
-        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
-
-      - name: Checkout mobile
-        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
-        with:
-          repository: freeCodeCamp/mobile
-          path: mobile
-
-      - name: Setup pnpm
-        uses: pnpm/action-setup@a3252b78c470c02df07e9d59298aecedc3ccdd6d #v3.0.0
-        with:
-          version: 9
-
-      - name: Use Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@60edb5dd545a775178f52524783378180af0d1f8 # v4.0.2
-        with:
-          node-version: ${{ matrix.node-version }}
-          cache: pnpm
-
-      - name: Setup Flutter 3.22.x
-        uses: subosito/flutter-action@2783a3f08e1baf891508463f8c6653c258246225 # v2
-        with:
-          flutter-version: '3.22.x'
-          channel: 'stable'
-          cache: true
-          cache-key: flutter-3.22.x
-          cache-path: ${{ runner.tool_cache }}/flutter
-
-      - name: Set freeCodeCamp Environment Variables
-        run: cp sample.env .env
-
-      - name: Install and Build
-        run: |
-          pnpm install
-          pnpm run create:shared
-          pnpm run build:curriculum
-
-      - name: Generate mobile test files
-        run: |
-          cd mobile/mobile-app
-          echo "DEVELOPMENTMODE=true" > .env
-          echo "NEWSURL=https://www.freecodecamp.org/news/ghost/api/v3/content/" >> .env
-          flutter pub get
-          flutter test test/widget_test.dart
-
-      - name: Install playwright dependencies
-        run: npx playwright install --with-deps
-
-      - name: Install serve
-        run: npm install -g serve
-
-      - name: Run playwright tests
-        run: npx playwright test --config=playwright-mobile.config.ts
-
-      - uses: actions/upload-artifact@v4
-        if: ${{ !cancelled() }}
-        with:
-          name: playwright-report-mobile
-          path: playwright/reporter
-          retention-days: 30