Refactor test scripts into scripts/ directory and improve CI

- Move run_tests_no_ot.sh and run_tests_with_ot.sh to scripts/ directory
- Create scripts/run_tests_with_coverage.py for coverage measurement
- Update CI to use scripts from scripts/ directory
- Eliminate code duplication between shell scripts and CI configuration
- Use Python script with coverage run for proper coverage measurement

scripts/run_tests_no_ot.sh

@@ -0,0 +1,30 @@
+#!/bin/bash
+# Run tests without OpenTelemetry enabled (default mode)
+# This is the default test mode for most users
+
+set -e
+
+echo "Running tests without OpenTelemetry (default mode)..."
+echo "====================================================="
+
+# Ensure OpenTelemetry is disabled
+export ENABLE_OPENTELEMETRY=false
+export OTEL_ENABLED=false
+
+# Run Django tests excluding OpenTelemetry-specific tests
+python3 manage.py test \
+    ivatar.ivataraccount.test_auth \
+    ivatar.ivataraccount.test_views \
+    ivatar.ivataraccount.test_views_bluesky \
+    ivatar.test_auxiliary \
+    ivatar.test_file_security \
+    ivatar.test_static_pages \
+    ivatar.test_utils \
+    ivatar.test_views \
+    ivatar.test_views_stats \
+    ivatar.tools.test_views \
+    ivatar.test_wsgi \
+    -v2
+
+echo ""
+echo "Tests completed successfully (OpenTelemetry disabled)"