fix: inttest runner crash and minio bucket-init proxy issue

- Remove --profiling-output arg from runner.yaml (plugin uses default path)
- Inline profiling hooks in root conftest.py with graceful fallback
- Replace mc-based bucket-init with Python urllib (no proxy interference)
- Add explicit ProxyHandler({}) to guarantee no proxy usage in bucket-init

infra/inttest/runner.yaml

@@ -49,7 +49,6 @@ spec:
             - "-v"
             - "--tb=short"
             - "--junitxml=/tmp/results.xml"
-            - "--profiling-output=/tmp/profiling-report.json"
           securityContext:
             allowPrivilegeEscalation: false
             readOnlyRootFilesystem: true