fix(ci): replace invalid --benchmark-skip flag with simple performance test

The --benchmark-skip flag is not a valid pytest argument, causing 'error:
unrecognized arguments' in beta-release workflow. Replaced with simple
performance test that doesn't require pytest-benchmark plugin.

Changes:
- Remove invalid --benchmark-skip flag
- Use simple_performance_test.py for performance validation
- Maintains performance verification without plugin dependencies
- Runs with optimal performance settings (4 threads, no memory debugging)

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

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

Author: sidmohan0

.github/workflows/beta-release.yml

@@ -126,9 +126,9 @@ jobs:
           echo "Running integration tests..."
           python run_tests.py -m integration --no-header
           
-          # Run benchmark tests with optimal performance (no memory debugging)
-          echo "Running benchmark tests with performance optimizations..."
-          OMP_NUM_THREADS=4 MKL_NUM_THREADS=4 OPENBLAS_NUM_THREADS=4 python -m pytest tests/benchmark_text_service.py -v --no-header --benchmark-skip
+          # Run simple performance validation (no pytest-benchmark dependency)
+          echo "Running simple performance validation..."
+          OMP_NUM_THREADS=4 MKL_NUM_THREADS=4 OPENBLAS_NUM_THREADS=4 python tests/simple_performance_test.py
 
       - name: Build package
         run: |