e2es setup (#374)

* remove next-12-3-1 fixture and add pages12.0.0 with simplePagesApiRoutes feature

* add simple fixtures and features

which test basic app/pages applications':
 - api routes
 - static routes and assets
 - server side rendered routes
 - soft navigations

.github/workflows/pull-request.yml

@@ -261,7 +261,7 @@ jobs:
       - name: Setup node
         uses: actions/setup-node@v3
         with:
-          node-version: 18.x
+          node-version: 16.13.x
 
       - name: Get current node version
         id: node-version
@@ -287,7 +287,11 @@ jobs:
         run: npm ci
 
       - name: Run e2e tests
-        run: npm run test:e2e
+        uses: nick-fields/retry@v2
+        with:
+          max_attempts: 3
+          timeout_minutes: 20
+          command: npm run test:e2e -- -- --log-timestamp
         env:
           CLOUDFLARE_API_TOKEN: ${{ secrets.CLOUDFLARE_API_TOKEN }}
           CLOUDFLARE_ACCOUNT_ID: ${{ vars.CLOUDFLARE_ACCOUNT_ID }}