Fix shellcheck SC2209 by using single-line background commands

Shellcheck was complaining about the multiline format for background
processes. Changed to single-line format using && to combine cd and
command execution.

Before:
```yaml
run: |
  cd spec/dummy
  RAILS_ENV=test rails server &
```

After:
```yaml
run: cd spec/dummy && RAILS_ENV=test rails server &
```

This eliminates the SC2209 warning while maintaining the same functionality.

Fixes: .github/workflows/pro-integration-tests.yml:207-217, 384-394

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: AbanoubGhadban

.github/workflows/pro-integration-tests.yml

@@ -205,16 +205,10 @@ jobs:
         run: cd spec/dummy && bundle exec rake react_on_rails:generate_packs
 
       - name: Run Pro Node renderer in background
-        run: |
-          cd spec/dummy
-          yarn run node-renderer &
-          true
+        run: cd spec/dummy && yarn run node-renderer &
 
       - name: Run Rails server in background
-        run: |
-          cd spec/dummy
-          RAILS_ENV=test rails server &
-          true
+        run: cd spec/dummy && RAILS_ENV=test rails server &
 
       - name: Wait for Rails server to start
         run: |
@@ -384,16 +378,10 @@ jobs:
         run: cd spec/dummy && bundle exec rake react_on_rails:generate_packs
 
       - name: Run Pro Node renderer in background
-        run: |
-          cd spec/dummy
-          yarn run node-renderer &
-          true
+        run: cd spec/dummy && yarn run node-renderer &
 
       - name: Run Rails server in background
-        run: |
-          cd spec/dummy
-          RAILS_ENV=test rails server &
-          true
+        run: cd spec/dummy && RAILS_ENV=test rails server &
 
       - name: Wait for Rails server to start
         run: |